Jubilees 49:22

And do thou, Moses, command the children of Israel to observe the ordinances of the passover, as it was commanded unto thee; declare thou unto them every year and the day of its days, and the festival of unleavened bread, that they should eat unleavened bread seven days, (and) that they should observe its festival, and that they bring an oblation every day during those seven days of joy before the Lord on the altar of your God.