C. F. Keil and Franz Delitzsch on Numbers 28:16-22

Num 28:16-22

The same number of sacrifices as at the new moon were to be offered on every one of the seven days of the feast of unleavened bread (Mazzoth), from the 15th to the 21st of the month, whereas there was no general festal offering on the day of the Passover, or the 14th of the month (Exo 12:3-14). With regard to the feast of Mazzoth, the rule is repeated from Exo 12:15-20 and Lev 23:6-8, that on the first and seventh day there was to be a Sabbath rest and holy meeting.