Observe in those verses, the service of the passover, and the feast of unleavened bread succeed each other. Particular directions had been given concerning the service of the passover, and the great mercy intended by it: the remembrance of which was to be kept up in the church in their perpetual generations. See Exodus 12:1 and if the Reader be pleased to read our Commentary on that Chapter, I pray the LORD to bless it to his perusal. But the sacred historian is directed to give particular directions concerning the feast of unleavened bread, which commenced the fifteenth day of the month, and lasted seven days.
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.