Deuteronomy 16:6
But at the place which the Lord thy God shall choose to place his name in, there thou shalt sacrifice the passover at even, at the going down of the sun, at the season that thou camest forth out of Egypt. (Deuteronomy 16:6)
At even.
 That is, between the twoevenings (see on Ex. 12:6). The evening sacrifice having been offered, the Passover victim was slain.
The season.
 Literally, “the appointed time” or “the place of meeting.” Compare “in the time appointed” (Ex. 23:15); “in the time of” (Ex. 34:18); “at a time appointed” (Joshua 8:14). The reference in this instance is to the appointed hour, namely, that of the Exodus from Egypt.