Below is the list of Sabbaths and Holy Days commanded by God The Father and His Son The Lord Jesus Christ, to be kept yearly at their set times.
Remember that God commanded the Sabbaths be kept from evening to evening (i.e. sundown to sundown). [Leviticus 23:32]
“And the LORD spoke unto Moses, saying,  Speak unto the children of Israel, and say unto them, Concerning the feasts of the LORD, which you will proclaim to be holy convocations, even these are My feasts.”
– Leviticus 23:1-2
Seventh Day Sabbath — begins sundown on Friday and ends sundown Saturday every week. The Holy Sabbath of The Lord; the fourth commandment of the Ten Commandments. Most likely the day referred to by the apostle John as the “Lord’s Day” in Revelations (Genesis 2:2-3, John 1:1-5, Luke 6:5 [Mark 2:27-28, Matthew 12:8-9]). God repeatedly commanded that it be kept on the seventh day (i.e. what we generally call Saturday). It is listed in Leviticus 23 as the first of the Sabbaths, an Holy Convocation (as His other Holy Days). [Leviticus 23:3, Exodus 20:8-11 (4th Commandment of the 10 Commandments), Exodus 31:13, Exodus 31:17, Ezekiel 20:12, Ezekiel 20:20, Hebrews 4:7-9, Hebrews 4:10-11, Matthew 5:18-20, Luke 6:46, Matthew 7:21];
Passover — evening of March 27th. Passover lamb was killed on the 14th of Abib before sundown (in the evening – or – between the evenings), and so the actual Lamb of God also died Passover day about 3pm in the afternoon and was buried at evening. The Passover representing The Lord Jesus Christ (Joshua the Messiah) the Passover Lamb’s blood saving those sanctified (repenting of sin, being baptized into Jesus Christ, and living a life of repentance and obedience) from the wrath of God (i.e. the judgment of God against sin). The first day of Unleavened Bread begins sundown that day. [Exodus 12:1-2, Exodus 12:18-19, Numbers 28:16-18, Leviticus 23:5-7, John 1:29, 1 Peter 1:19, Rev. 5:6, Matthew 26:2, Mark 14:22-25, John 19:34-37, 1 Thes. 1:9-10, Luke 6:46, Matthew 7:21];
First Day of Unleavened Bread — begins sundown March 27th. Ends sundown April 28rd. The Days of Unleavened Bread is a week long obsevance of the removal and obstaining from all forms of leavening (representing sin – i.e. the breaking of God’s Law [1 John 3:4 “Whosoever commits sin transgresses also the law: for sin is the transgression of the law.”]). [Exodus 12:1-2, Exodus 12:5-10, Exodus 12:11-14, Exodus 12:18-19, Numbers 28:16-18, Leviticus 23:5-7, Acts 20:6, 1 Cor. 5:7-8 (speaking to non-Jews), Luke 6:46, Matthew 7:21];
Last Day of Unleavened Bread — begins sundown April 2nd. Ends sundown April 3th. The last day of Unleavened Breads ends the Days of Unleavened Bread with a Holy Convocation (i.e. a “Holy Meeting” [i.e. gathering]). [Leviticus 23:8, Exodus 12:18-20, Luke 6:46, Matthew 7:21];
Wave Sheaf of the First Fruits — April 4th. This is not a Sabbath or Feast, but is never the less an important day to note here. It represents the presentation of our Lord Jesus Christ to God The Father after His resurrection the evening before. This is also the day which begins the 50 day count to Pentecost. The wave sheed of the first fruits was waved before God the day after the Sabbath following the Passover. [Leviticus 23:9-15, Exodus 34:25-26, Deut. 26:1-11, John 20:16-18, 1 Cor. 15:20, 1 Cor. 15:23, Luke 6:46, Matthew 7:21];
Pentecost — begins sundown May 22nd. Ends sundown May 23rd. Referred to in the New Testament as “Pentecost” (Pentecost means “fiftieth”) and in the Old Testament as “First Fruits” and “Feast of Weeks”. Represented, then and now, the receiving of those sanctified (made Holy) by The Lord’s sacrifice (the Passover Lamb [see Passover above]), and the Holy Spirit of The Lord Jesus being given. [Leviticus 23:15-16, Leviticus 23:17, Leviticus 23:18-21, Numbers 28:26, Deut. 16:9-12, Acts 1:4-5, Jeremiah 31:31-40, Hebrews 10:12-23, Acts 2:1-4, Acts 2:14-18, Acts 2:32-33, Acts 2:36, Acts 2:37-38, Romans 2:28-29, Romans 9:6, Galatians 3:7-9, Galatians 6:16, Romans 8:9, John 14:21, John 14:23-24, Luke 6:46, Matthew 7:21];
Feast of Trumpets — begins sundown September 6th. Ends sundown September 7th. Referred to as a “memorial of blowing of trumpets” (or memorial of acclamation [i.e. shout, jubile, joy]). The Holy Day represents the return of The Lord Jesus to reign as King and High Priest, raising His people from their graves into glorification, and ruling over the nations in righteousness with a rod of iron. [Leviticus 23:23-25, Numbers 29:1, Matthew 24:30-31, John 5:26-31, 1 Cor. 15:50-58, Luke 6:46, Matthew 7:21];
Atonement — begins sundown September 15th. Ends sundown September 16th. The atonement (At-One-Ment) [covering and removal] of sin. [Leviticus 23:26-32, Leviticus 16:29-31, Leviticus 25:8-9, Leviticus 16:30, Romans 5:8-11, 2 Cor. 5:18-21, Luke 6:46, Matthew 7:21];
First Day of The Feast of Tabernacles — begins sundown September 20th. Ends sundown September 21st. This eight day feast before The Lord begins with this Holy Day. Also referred to in the Old Testement as the “Feast of Ingathering”. [Leviticus 23:33-35, Numbers 29:12, Deut. 16:13-15, John 7:1-10, John 6:63, 2 Cor. 4:18-5:1, Luke 6:46, Matthew 7:21];
The Eigth Day (of The Feast of Tabernacles) — begins sundown September 27th. Ends sundown September 28th. Referred to in the New Testement as the “Great (or High) day of the Feast”. This day closes the year’s Holy Days and represents the return of God The Father; creating a new heaven and earth in which dwells righteousness and God dwells with men. He will be their God and they will be His people. [Leviticus 23:36, Leviticus 23:36, Numbers 29:35, Leviticus 23:39-43, John 7:37-39, 1 Cor. 15:23-28, Rev. 21:3-4, Isaiah 25:6-9, Luke 6:46, Matthew 7:21];
“These are the feasts of the LORD, which you will proclaim to be holy convocations, to offer an offering made by fire unto the LORD, a burnt offering, and a meat offering, a sacrifice, and drink offerings, every thing upon his day:  Beside the sabbaths of the LORD, and beside your gifts, and beside all your vows, and beside all your freewill offerings, which ye give unto the LORD.”
– Leviticus 23:37-38
Notice here God is speaking of the future – “My salvation is near to come, My righteousness to be revealed”. He still tells the people who are not of the fleshly lineage of Israel (i.e. Gentiles) to keep His Sabbath and covenant, to keep away from sin (sin as defined by God’s Word [i.e. breaking His Law]).
“Thus saith the LORD, Keep you judgment, and do justice: for My salvation is near to come, and My righteousness to be revealed.  Blessed is the man that does this, and the son of man that lays hold on it; that keeps the sabbath from polluting it, and keeps his hand from doing any evil.  Neither let the son of the stranger, that has joined himself to the LORD, speak, saying, The LORD has utterly separated me from His people: neither let the eunuch say, Behold, I am a dry tree.  For thus says the LORD unto the eunuchs that keep My sabbaths, and choose the things that please Me, and take hold of My covenant;  Even unto them will I give in My house and within My walls a place and a name better than of sons and of daughters: I will give them an everlasting name, that will not be cut off.  Also the sons of the stranger, that join themselves to the LORD, to serve Him, and to love the name of the LORD, to be His servants, every one that keeps the sabbath from polluting it, and taketh hold of My covenant;  Even them will I bring to My holy mountain, and make them joyful in My house of prayer: their burnt offerings and their sacrifices will be accepted upon My altar; for My house will be called an house of prayer for all people.  The Lord GOD which gathers the outcasts of Israel says, Yet will I gather others to him, beside those that are gathered unto him.”
– Isaiah 56:2-8
“And every man that hath this hope in him purifieth himself, even as he is pure.  Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.”
– 1 John 3:3-4
“But if, while we seek to be justified by Christ, we ourselves also are found sinners, is therefore Christ the minister of sin? God forbid.  For if I build again the things which I destroyed, I make myself a transgressor.  For I through the law am dead to the law, that I might live unto God.  I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.”
– Galatians 2:17-20
“What shall we say then? Shall we continue in sin, that grace may abound?  God forbid. How shall we, that are dead to sin, live any longer therein?”
– Romans 6:1-2
Please recognize that Paul was never teaching that we did not have to obey The Law. He was simply showing that salvation did not come by the works of the Law. Since ever person (except Christ) has sinned (broken the Law) it is impossible to then obtain the righteousness of the Law [“Cursed be he that confirms not all the words of this law to do them. And all the people will say, Amen.” – Deut. 27:26; AND “You will do My judgments, and keep My ordinances, to walk therein: I am the LORD your God.  You will therefore keep My statutes, and My judgments: which if a man do, he will live in them: I am the LORD.” – Leviticus 18:4-5]. Only by God’s redemption through The Lord Jesus Christ could we be cleansed to once again remove the guilt.
But as you see above (and those are only a few instances) Paul was saying that if we refuse to obey God’s Law (which John plainly shows is the DEFINITION of sin) then we are removing ourselves from the grace of God and putting ourselves back under the wrath of the Law (i.e. God’s judgement of sinners – the wrath to come).
The above verses are just a sampling of what God The Father, The Lord Jesus Christ, Their apostles and prophets have all said. Please open your Bible and read. Accept what God has written – not what we prefer to say He meant.