Matthew Poole and continuators on Deuteronomy 16:8

8 Six dayes thou shalt eat unleavened bread, and on the seventh day shall be a solemn assembly to the LORD thy God thou shalt do no work therein.

To wit, besides the first day, on which the passeover was killed: or rather besides the seventh and the last day, which is here mentioned apart, not as if leavened bread might be eaten then, for the contrary was evident from many places, but because there was something more to be done, to wit a solemn assembly to be kept. So in all there were seven dayes, as it is said Exod. 12. 15. Levit. 23. 6. Numb. 28. 17.

Marginal references: Heb. restraint.