Exodus 16:5

And it shall come to pass, that on the sixth day they shall prepare that which they bring in; and it shall be twice as much as they gather daily.

On the sixth day they shall prepare that which they bring in. It was the sixth day of the week, not the sixth day by current reckoning from that on which the promise was made; and the preparation of the food of that day consisted, first, in measuring what they had gathered, according to the appointed standard; and, secondly, in grinding, baking, and seething it as meal (cf. Exodus 16:23; Numbers 11:8).

And it shall be twice as much as they gather daily. The supply of a double quantity was promised on the sixth day. No reason was assigned for this deviation from the arrangement followed; and God, it appears, did not think that it was necessary to adduce a reason in a case so obvious. In these verses (namely, 4,5) the substance of the promise is expressed; but the passage that follows contains specific details as given by Moses and Aaron in several communications to the people; and as their complaints, though vented against their earthly leaders, were really directed against God, Moses, who disclaimed the unfounded imputation of having brought them out of Egypt by his own will and authority, apprised them that, at a certain specified time, they, through the engrossing influence of these, would be furnished with unmistakeable proofs as to who was their true deliverer and guide.