Exodus 16:33-36 English Standard Version (ESV)

33. And Moses said to Aaron, “Take a jar, and put an omer of manna in it, and place it before the Lord to be kept throughout your generations.”

34. As the Lord commanded Moses, so Aaron placed it before the testimony to be kept.

35. The people of Israel ate the manna forty years, till they came to a habitable land. They ate the manna till they came to the border of the land of Canaan.

36. (An omer is the tenth part of an ephah.)

Exodus 16