Exodus 16:15-18

15When the Israelites saw it, they said to each other, “What is it?” For they did not know what it was. Moses said to them, “It is the bread the LORD has given you to eat.

16This is what the LORD has commanded: ‘Everyone is to gather as much as they need. Take an omer That is, possibly about 3 pounds or about 1.4 kilograms; also in verses 18, 32, 33 and 36 for each person you have in your tent.’ ” 17The Israelites did as they were told; some gathered much, some little.

18And when they measured it by the omer, the one who gathered much did not have too much, and the one who gathered little did not have too little. Everyone had gathered just as much as they needed.