Exodus 16:16
This is the thing which Jehovah hath commanded: Gather of it each according to his eating, an omer for a poll; and the number of your persons, take ye each for those in his tent.'
Exodus 16:36
and the omer is a tenth of the ephah.
Exodus 16:18
and they measure with an omer, and he who is gathering much hath nothing over, and he who is gathering little hath no lack, each according to his eating they have gathered.
Exodus 16:32-33
And Moses saith, 'This is the thing which Jehovah hath commanded: Fill the omer with it, for a charge for your generations, so that they see the bread which I have caused you to eat in the wilderness, in My bringing you out from the land of Egypt.'