Cross reference
Exodus 16:36
36 Now an omer is the tenth part of an ephah.
Exodus 16:16
16 This is what the Lord has said, Let every man take up as much as he has need of; at the rate of one omer for every person, let every man take as much as is needed for his family.
Exodus 16:32-33
32 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 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.