Exodus 16:16-18

16This is the thing which the LORD hath commanded, Gather of it every man according to his eating, an omer for every man, according to the number of your persons; take ye every man for them who are in his tents.12 17And the children of Israel did so, and gathered, some more, some less. 18And when they measured it with an omer, he that gathered much had nothing over, and he that gathered little had no lack; they gathered every man according to his eating.