Exodus 16:22

16:22 And on the sixth day they gathered twice as much food, two omers per person; and all the leaders of the community came and told Moses.

Exodus 16:32-33

16:32 Moses said, “This is what the Lord has commanded: ‘Fill an omer with it to be kept for generations to come, so that they may see the food I fed you in the desert when I brought you out from the land of Egypt.’” 16:33 Moses said to Aaron, “Take a jar and put in it an omer full of manna, and place it before the Lord to be kept for generations to come.”

Exodus 16:36

16:36 (Now an omer is one tenth of an ephah.)