Exodus 16:16
Moses told them, "It's the food that the LORD has given you to eat. This is what the LORD has commanded: "You are to gather from it what each person is to eat, about one omer per person according to the number of your people, and one person is to gather for everyone in his tent.'"
Exodus 16:36
Now one omer is a tenth of an ephah.
Exodus 16:18
When they measured it with a vessel the capacity of which was one omer, the one who gathered much did not have an excess, while the one who gathered little did not lack. They gathered exactly what each needed to eat.
Exodus 16:32-33
Moses said, "This is what the LORD has commanded: "Set aside one omer of it for future generations, so that they may see the food with which I fed you in the desert when I brought you out of the land of Egypt.'"