It is a sign between me and the children of Israel for ever: for in six days the LORD made heaven and earth, and on the seventh day he rested, and was refreshed.
The sabbath is the hem and hedge of the whole law: where no conscience is made of it, farewell both godliness and honesty. God repeats it here with jealous care because the urgency of tabernacle-work might tempt them to break it, but even sacred work must yield to sabbath rest.
AI summary
Commenting on Exodus 31:12-18
The sabbath sign lasts forever in the sense that all God's covenant signs did, unto the end of the Jewish state at Christ's coming, when a new world began. God's rest and refreshment are spoken after the manner of men; He cannot truly labor or tire, but this denotes His cessation from creation's works and His delight in them, which makes the law's reasonableness clear.
AI summary
It [is] a sign between me and the children of Israel for ever: for [in] six days the LORD made heaven and earth, and on the seventh day he rested, and was refreshed. (h) From creating his creatures, but not from governing and preserving them.