Exodus 16:18-21

And 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.

He that gathered much had nothing over ... Although this miraculous food was provided in great profusion, yet much of it was erelong melted by the sun on being stored up by the avaricious; and it appears, by comparing this passage with 2 Corinthians 8:15, that the daily supply which remained free from putrefaction was just what was equal in amount to an omer for each person throughout the camp of Israel.