Albert Barnes Commentary Joshua 5:11

"And they did eat of the produce of the land on the morrow after the passover, unleavened cakes and parched grain, in the selfsame day." — Joshua 5:11 (ASV)

Old corn of the land - Rather, "produce of the land," the new grain just coming in at the time of the Passover .

On the morrow after the passover - In Numbers 33:3, these words denote the 15th Nisan, but here they must apparently mean the 16th.

The reason is that the Israelites could not lawfully eat the new grain until its first fruits had been presented. This presentation occurred on "the morrow after the Sabbath"—that is, the day after the first day of Unleavened Bread. The first day of Unleavened Bread was to be observed as a Sabbath, and is therefore so called (Compare Leviticus 23:7, Leviticus 23:11, and Leviticus 23:14).

The term Passover, which is sometimes used for the lamb slain on the evening of the 14th Nisan, sometimes for the paschal meal, and sometimes for the whole eight-day festival, here means the first great day of the eight, the Sabbath of the first holy convocation.