Exodus 16:33-36

33Moses said to Aaron, “Take a jar and put a full omer of manna inside. Store it up before Adonai, to be kept throughout your generations.”

34Just as Adonai commanded Moses, Aaron stored it up in front of the Testimony, to be preserved.

35Bnei-Yisrael ate the manna for 40 years. They ate the manna until they came to an inhabited land, when they came to the borders of the land of Canaan.

36Now an omer is the tenth part of an ephah.