And it happened, on the sixth day they gathered twice as much bread, two omers for one. And all the rulers of the congregation came and told Moses.

And Moses said, This is the thing which Jehovah has commanded: Fill an omer of it to be kept for your generations, so that you may see the bread with which I have fed you in the wilderness, when I brought you forth from the land of Egypt. And Moses said to Aaron, Take a pot and put an omer full of manna in it, and lay it up before Jehovah, to be kept for your generations.

And an omer is the tenth part of an ephah.