Exodus 16:34

The house of Israel called its name “Manna”, and it was like coriander seed, white; and its taste was like wafers with honey.

Moses said, “This is the thing which the LORD has commanded, ‘Let an omer-full of it be kept throughout your generations, that they may see the bread with which I fed you in the wilderness, when I brought you out of the land of Egypt.’”

Moses said to Aaron, “Take a pot, and put an omer-full of manna in it, and lay it up before the LORD, to be kept throughout your generations.”

The children of Israel ate the manna forty years, until they came to an inhabited land. They ate the manna until they came to the borders of the land of Canaan.

Now an omer is one tenth of an ephah.