Exodus 12:24

12:24 You must observe this event as an ordinance for you and for your children forever.

Exodus 13:10

13:10 So you must keep ¹  this ordinance at its appointed time from year to year. ² 

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¹ tn The form is a perfect tense with the vav (ו) consecutive, functioning as the equivalent of an imperfect of instruction or injunction.

² tn Or “every year,” or “year after year.”