Genesis 1:15

1:14-31 On days 4–6, God filled the domains that had been formed during days 1–3 (1:3-13). 1:14 Let them . . . mark the seasons, days, and years: The movement of the heavenly bodies defined Israel’s liturgical calendar, whose roots in creation gave a sacred timing to Israel’s festivals and celebrations (see Exod 23:15; Lev 23:4).