Sabbath or Sunday

Ex 20:8

Remember the sabbath day, to keep it holy.

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"I am the LORD your God, who brought you out of Egypt, out of the land of slavery.
1. You shall have no other gods before me.
2. You shall not make for yourself an idol in the form of anything in heaven above or on the earth beneath or in the waters below. You shall not bow down to them or worship them; for I, the LORD your God, am a jealous God, punishing the children for the sin of the fathers to the third and fourth generation of those who hate me, but showing love to a thousand generations of those who love me and keep my commandments.
3. You shall not misuse the name of the LORD your God, for the LORD will not hold anyone guiltless who misuses his name.
4. Remember the Sabbath day by keeping it holy. Six days you shall labor and do all your work, but the seventh day is a Sabbath to the LORD your God. On it you shall not do any work, neither you, nor your son or daughter, nor your manservant or maidservant, nor your animals, nor the alien within your gates. For in six days the LORD made the heavens and the earth, the sea, and all that is in them, but he rested on the seventh day. Therefore the LORD blessed the Sabbath day and made it holy.
5. Honor your father and your mother, so that you may live long in the land the LORD your God is giving you.
6. You shall not murder.
7. You shall not commit adultery.
8. You shall not steal.
9. You shall not give false testimony against your neighbor.
10. You shall not covet your neighbor's house. You shall not covet your neighbor's wife, or his manservant or maidservant, his ox or donkey, or anything that belongs to your neighbor."

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Matt 28:1-2

28:1 In the end of the sabbath, as it began to dawn toward the first day of the week, came Mary Magdalene and the other Mary to see the sepulchre.

Mark 16:1-2

16:1 And when the sabbath was past, Mary Magdalene, and Mary the mother of James, and Salome, had bought sweet spices, that they might come and anoint him.

2 And very early in the morning the first day of the week, they came unto the sepulchre at the rising of the sun.

Mark 16:9

9 Now when Jesus was risen early the first day of the week, he appeared first to Mary Magdalene, out of whom he had cast seven devils.

Luke 23:52-24:2

52 This man went unto Pilate, and begged the body of Jesus.

53 And he took it down, and wrapped it in linen, and laid it in a sepulchre that was hewn in stone, wherein never man before was laid.

54 And that day was the preparation, and the sabbath drew on.

55 And the women also, which came with him from Galilee, followed after, and beheld the sepulchre, and how his body was laid.

56 And they returned, and prepared spices and ointments; and rested the sabbath day according to the commandment.

Luke 24

24:1 Now upon the first day of the week, very early in the morning, they came unto the sepulchre, bringing the spices which they had prepared, and certain others with them.

John 19:40-20:1

40 Then took they the body of Jesus, and wound it in linen clothes with the spices, as the manner of the Jews is to bury.

41 Now in the place where he was crucified there was a garden; and in the garden a new sepulchre, wherein was never man yet laid.

42 There laid they Jesus therefore because of the Jews' preparation day; for the sepulchre was nigh at hand.

John 20

1 The first day of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.

( the believers and followers of Jesus were still keeping the Sabbath Day )

John 20:19-26

19 Then the same day at evening, being the first day of the week, when the doors were shut where the disciples were assembled for fear of the Jews, came Jesus and stood in the midst, and saith unto them, Peace be unto you.

20 And when he had so said, he shewed unto them his hands and his side. Then were the disciples glad, when they saw the Lord.

21 Then said Jesus to them again, Peace be unto you: as my Father hath sent me, even so send I you.

22 And when he had said this, he breathed on them, and saith unto them, Receive ye the Holy Ghost:

( the day of Pentecost was not yet come, yet these were given the Holy Ghost )

23 Whose soever sins ye remit, they are remitted unto them; and whose soever sins ye retain, they are retained.

24 But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.

25 The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side, I will not believe.

26 And after eight days again his disciples were within, and Thomas with them: then came Jesus, the doors being shut, and stood in the midst, and said, Peace be unto you.

Acts 20:7

7 And upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight.

1 Cor 16:1-3

16:1 Now concerning the collection for the saints, as I have given order to the churches of Galatia, even so do ye.

2 Upon the first day of the week let every one of you lay by him in store, as God hath prospered him, that there be no gatherings when I come.

3 And when I come, whomsoever ye shall approve by your letters, "them" will I send to bring your liberality unto Jerusalem.

Acts 13:14

14 But when they departed from Perga, they came to Antioch in Pisidia, and went into the synagogue on the sabbath day, and sat down.

Acts 13:42-44

42 And when the Jews were gone out of the synagogue, the Gentiles besought that these words might be preached to them the next sabbath.

43 Now when the congregation was broken up, many of the Jews and religious proselytes followed Paul and Barnabas: who, speaking to them, persuaded them to continue in the grace of God.

44 And the next sabbath day came almost the whole city together to hear the word of God.

Acts 16:13

13 And on the sabbath we went out of the city by a river side, where prayer was wont to be made; and we sat down, and spake unto the women which resorted thither.

Acts 17:2

2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,

Acts 18:4

4 And he reasoned in the synagogue every sabbath, and persuaded the Jews and the Greeks.

( after the resurrection and his conversion to Christ, Paul continued to worship on Sabbath )

Col 2:16-17

16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:

17 Which are a shadow of things to come; but the body is of Christ.

( though Paul himself continued to worship on the Sabbath Day, he told the church not to accept the judgment of others concerning meat, drink, respect ("recognition / acceptance") of a holyday, new moon, or of the sabbath days )

Rom 14:5-6

5 One man esteemeth one day above another: another esteemeth every day alike. Let every man be fully persuaded in his own mind.

6 He that regardeth the day, regardeth it unto the Lord; and he that regardeth not the day, to the Lord he doth not regard it. He that eateth, eateth to the Lord, for he giveth God thanks; and he that eateth not, to the Lord he eateth not, and giveth God thanks.

KJV

( whether we worship on one day or the other by assembling ourselves together, let it not be by law but by love of heart toward Christ, for all things are to be done in worship and honor to Him. )