What contradictions? I don't see any verse of the NT that explicitly sets aside the Saturday sabbath, and even those who torture the text to find an implicit setting aside can find no authority in the NT for establishing a Sunday sabbath in its place. (Unless you make the mistake of conflating the Sabbath with the Lord's Day.)
I never said Sunday is the NT Sabbath, for the NT Sabbath is the eternal rest, the exact same one in Gen ch 1, not the 24 hr/week rest given to Israel as a shadow of what was to come. Therefore, there does remain a Sabbath rest for the people of God, and it is the real eternal one, not the 24 hr/week one.
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There are fairly few places in the OT where YHWH speaks of something as being perpetual. The seventh day sabbath is perpetual. The Aharonic priesthood is perpetual, the covenant to never flood the earth again is perpetual. Perpetuity is not something that God takes lightly in the OT. When he says perpetual, he damn well means perpetual.
Actually, there is a whole list of things within the Law of Moses that meet that “perpetual” definition, and they were ALL done away with having been fulfilled in Christ. And the NT EXPLICITLY states the Levitical priesthood (“Aharonic priesthood”) is GONE:
Heb 7:11 ”If perfection could have been attained through the Levitical priesthood—and indeed the law given to the people established that priesthood—why was there still need for another priest to come, one in the order of Melchizedek, not in the order of Aaron? 12
For when the priesthood is changed, the law must be changed also.”
The law within the Law of Moses stating priests must be of the order of Aaron has been changed, and it has reverted back the previous priesthood in the order of Melchizedek (just like the dietary law reverted back to the previous diet of Noah).
There are entire chapters on this in the book of Hebrews, yet you didn’t understand it years ago when we discussed it, and you still don’t see it, so this conversation is pointless.