Leviticus 23:5-8

“GOD’s Passover, beginning at sundown on the fourteenth day of the first month. “GOD’s Feast of Unraised Bread, on the fifteenth day of this same month. You are to eat unraised bread for seven days. Hold a sacred assembly on the first day; don’t do any regular work. Offer Fire-Gifts to GOD for seven days. On the seventh day hold a sacred assembly; don’t do any regular work.”