Exodus 16:16-18

16This is the thing which Yhwh 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 which are in his tents.12 17And the children of Israel did so, and gathered, some more, some less. 18And when they did mete 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.