Exodus 16
32 Ref And Moses said, This is the order which the Lord has given: Let one omer of it be kept for future generations, so that they may see the bread which I gave you for your food in the waste land, when I took you out from the land of Egypt.
33 Ref And Moses said to Aaron, Take a pot and put one omer of manna in it, and put it away before the Lord, to be kept for future generations.
34 Ref So Aaron put it away in front of the holy chest to be kept, as the Lord gave orders to Moses.