When did Israel stop eating manna and start eating old corn?
Israel stopped eating manna and began eating the old corn of the land of Canaan on the morrow after the Passover, after they had crossed the Jordan River and been circumcised. The manna ceased at that point, and they partook of stored grain from the Canaanites' granaries.
Les explains that after Israel crossed the Jordan, was circumcised, and celebrated the Passover, they ate the old corn of Canaan on the morrow after the Passover. They had eaten manna for 40 years, but now the manna stops. Les notes this old grain was probably stored in the granaries of the Canaanites. He sees it as a picture: crossing the Jordan pictures our coming through the death, burial, and resurrection of Christ, and the Old Testament has New Testament doctrine symbolically attached.