What the substance called manna was, is utterly unknown, but Exodus 16:5 Exodus 16:16 Leviticus 25:12 Leviticus 25:22
Related Commentaries of Exodus 16:22
Exodus 16:22
22 And it came to pass, that on the sixth day they gathered twice as much bread, two omers for one man: and all the rulers of the congregation came and told Moses.