Thematic Bible: Observance of, to be perpetual

Therefore shall the sons of Israel keep the sabbath, - by making it a Day of Rest to your generations, as an age-abiding covenant: between me and the sons of Israel, a sign it is unto times age-abiding, - for in six days, did Yahweh make the heavens and the earth, and on the seventh day, he rested, and was refreshed.