It is manna; or, What is this ? which best suits with the following reason, for they wist not what it was. Man signifies what in the Egyptian tongue; and it is not strange that the Israelites use one of their words, being newly come out of their land. Hence this is called manna; but it is of a different nature from the ordinary manna, which now we use only as physic for purging; whereas this manna was food, and nourishing, being prepared by the great God for this use.
Related Commentaries of Exodus 16:15
Exodus 16:15
15 And when the children of Israel saw it, they said one to another, It is manna: for they wist not what it was. And Moses said unto them, This is the bread which the LORD hath given you to eat.