Isaiah 56:2, 6

Blessed is the one who will faithfully keep his commitment. Yes, blessed is the one who honors the Sabbath and does not disregard it, and the one who keeps their hands from doing evil.”

And to the foreigners who join themselves to YAHWEH to worship him, those who want to be his servants and love the name of YAHWEH— all who honor the Sabbath and do not disregard it, and who remain true to my covenant—I make this promise