Exodus 16:31-36

Now the house of Israel called its name manna. It was like coriander seed, white, and the taste of it was like wafers made with honey. Moses 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.’” 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.” As the LORD commanded Moses, so Aaron placed it before the testimony to be kept. 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. (An omer is the tenth part of an ephah.)