Keluaran 13:10

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

[13:10]  ¹ tn The form is a perfect tense with the vav (ו) consecutive, functioning as the equivalent of an imperfect of instruction or injunction.

[13:10]  ² tn Or “every year,” or “year after year.”