Exodus 16:32-34

32Moses said, "This is what the Lord has commanded: 'Let an omer of it be kept throughout your generations, so that they may see the bread with which I fed you in the wilderness, when I brought you out of the land of Egypt.'"

33And 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."

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