At even, i.e. of the passover properly so called, and by these words plainly described; which circumlocution may seem to insinuate that the word passover, Deuteronomy 16:1, was improperly used, and therefore he chose rather to describe it than to name it, lest the ambiguity of the word should occasion some mistake.
Related Commentaries of Deuteronomy 16:4
Deuteronomy 16:4
4 And there shall be no leavened bread seen with thee in all thy coast seven days; neither shall there any thing of the flesh, which thou sacrificedst the first day at even, remain all night until the morning.