פירוש על יהושע 5:12

No longer did the Bnei Yisroel have manna. Therefore they ate of the grain of the land. If they would have had manna they would not have eaten of the grain, for the manna was agreeable to them. There is a parable for this: One says to a child, “Why are you eating barley bread?” “Because I have no wheat bread.” That is why it is said, ‘no longer did etc.’