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Where did God state which day was to be the sabbath? God says six days we work on the seventh it is reserved for God. Most Christians equate "Lord's Day" ( Sunday) with "Sabbath", this is kept in commemoration of the resurrection of Christ, it is often celebrated with the Eucharist. For many it is the day of rest, and of communal worship in remembrance of Resurrection Day.
-- God imposed Saturday as a day of rest and forbidden to work in it. God sanctified that day. The word "Saturday " is repeated in the Old Testament and in the Old Testament 94 times . But it was written "Sabbath" in the English version . It was known that it means "Saturday" till now . God said in the Bible :
See, for that the LORD hath given you the sabbath, therefore he giveth you on the sixth day the bread of two days; abide ye every man in his place, let no man go out of his place on the seventh day.(Exo 16/29)
Ye shall keep the sabbath therefore; for it is holy unto you: every one that defileth it shall surely be put to death: for whosoever doeth any work therein, that soul shall be cut off from among his people.(Exo31/14)
12 Keep the sabbath day to sanctify it, as the LORD thy God hath commanded thee.
13 Six days thou shalt labor, and do all thy work:
14 But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son,(Deu 5/12-14)
-- The Christ adopted that day also because he said :" Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.(Mat 5/17) and that is found in the New Testament.