Exodus 12:17 - Clarke's commentary and critical notes on the Bible

And ye shall observe the feast of unleavened bread; for in this selfsame day have I brought your armies out of the land of Egypt: therefore shall ye observe this day in your generations by an ordinance for ever. Self-same day - בעצם beetsem, in the body of this day, or in the strength of this day; probably they began their march about day-break, called here the body or strength of the day, and in Deuteronomy 16:1, by night - sometime before the sun rose.