14 having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross.
15 When He had disarmed the rulers and authorities, He made a public display of them, having triumphed over them through Him.
16 Therefore no one is to act as your judge in regard to food or drink or in respect to a festival or a new moon or a Sabbath day–
Question of the Sabbath
23 And it happened that He was passing through the grainfields on the Sabbath, and His disciples began to make their way along while picking the heads of grain.
24 The Pharisees were saying to Him, "Look, why are they doing what is not lawful on the Sabbath?"
25 And He said to them, "Have you never read what David did when he was in need and he and his companions became hungry;
26 how he entered the house of God in the time of Abiathar the high priest, and ate the consecrated bread, which (24) is not lawful for anyone to eat except the priests, and he also gave it to those who were with him?"
27 Jesus said to them, "The Sabbath was made for man, and not man for the Sabbath.
28 “So the Son of Man is Lord even of the Sabbath.”
4 Who are you to judge the servant of another? To his own master he stands or falls; and he will stand, for the Lord is able to make him stand.
5 One person regards one day above another, another regards every day alike. Each person must be fully convinced in his own mind.
6 He who observes the day, observes it for the Lord, and he who eats, does so for the Lord, for he gives thanks to God; and he who eats not, for the Lord he does not eat, and gives thanks to God.
7 For not one of us lives for himself, and not one dies for himself;
8 for if we live, we live for the Lord, or if we die, we die for the Lord; therefore whether we live or die, we are the Lord’s.
Years ago (before becoming Catholic) I came across SDA literature that claimed we should worship on Saturday instead of Sunday. I read the NT cover to cover, and it was verses mentioned above (as well as Acts 20:7, and 1 Corinthians 16:2) that convinced me they were wrong.
St. Ignatius of Antioch also gives evidence of what day the early Christians worshipped on:
We have seen how former adherents of the ancient customs have since attained to a new hope; so that they have given up keeping the Sabbath, and now order their lives by the Lord’s Day instead.