The fourteenth day of the first month The fourth stated and national sacrifice was annual, namely, the great passover festival, with the feast of unleavened bread annexed to it. In the fifteenth day On the fourteenth day at even the passover was kept; and the next day began the feast of unleavened bread, Leviticus 23:6.
Related Commentaries of Numbers 28:16
Numbers 28:16-17
16 And in the fourteenth day of the first month is the passover of the LORD.
17 And in the fifteenth day of this month is the feast: seven days shall unleavened bread be eaten.