Exodus 16:32-36

32Moses said, “This is what the LORD has commanded: ‘Take an omer of manna and keep it for the generations to come, so they can see the bread I gave you to eat in the wilderness when I brought you out of Egypt.’ ”

33So Moses said to Aaron, “Take a jar and put an omer of manna in it. Then place it before the LORD to be kept for the generations to come.” 34As the LORD commanded Moses, Aaron put the manna with the tablets of the covenant law, so that it might be preserved.

35The Israelites ate manna forty years, until they came to a land that was settled; they ate manna until they reached the border of Canaan. 36(An omer is one-tenth of an ephah.)