Exodus 12:17

17So you will keep the Feast of Unleavened Bread, because on this very
Heb “on the bone of this day.” The expression means “the substance of the day,” the day itself, the very day (S. R. Driver, Exodus, 95).
day I brought your regiments
The word is “armies” or “divisions” (see Exod 6:26 and the note there; cf. also 7:4). The narrative will continue to portray Israel as a mighty army, marching forth in its divisions.
out from the land of Egypt, and so you must keep this day perpetually as a lasting ordinance.
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