Book of Jubilees 49:7–9

⁷ And remember thou this day all the days of thy life, and observe it from year to year all the days of thy life, once a year, on its day, according to all the law thereof, and do not adjourn (it) from day to day, or from month to month. (JUB) ⁸ For it is an eternal ordinance, and engraven on the heavenly tablets regarding all the children of Israel that they should observe it every year on its day once a year, throughout all their generations; and there is no limit of days, for this is ordained for ever. (JUB) ⁹ And the man who is free from uncleanness, and does not come to observe it on occasion of its day, so as to bring an acceptable offering before the Lord, and to eat and to drink before the Lord on the day of its festival, that man who is clean and close at hand shall be cut off: because he offered not the oblation of the Lord in its appointed season, he shall take the guilt upon himself. (JUB)