Every one of you shall revere his mother and his father, and you shall keep my Sabbaths: I am YHVH your God. Do not turn to idols or make for yourselves any gods of cast metal: I am YHVH your God.
Leviticus 19:3-4

If YHWH is your God, then keep the #sabbath on the 7th day as He commanded. If He isn't, if that other guy is your god (or you think you are), then do what you want (which is actually what he wants), "But as long as you live under My roof..."

When God adds "I am YHVH" to a command, he's saying "Do it because you're mine and it's what I want." Remember that God never changes.