Exodus 31:15-17

Verse

15 For six days work may be done, but the seventh day is a Sabbath of complete rest, holy to Yahweh. Whoever does any work on the Sabbath day must surely be put to death. 16 The Israelites must keep the Sabbath, celebrating it as a permanent covenant for the generations to come. 17 It is a sign between Me and the Israelites forever; for in six days Yahweh made the heavens and the earth, but on the seventh day He rested and was refreshed.’” (BSB)