There were good reasons for not exceeding a day's ration in the daily downpour of manna. First, that they might be spared the need of carrying it on their wanderings; secondly, that they might daily receive it hot; and, lastly, that they might day by day depend upon God's aid, and in this way exercise themselves in faith.
While the people were still abed, God fulfilled their desire, and rained down manna for them. For this food had been created on the second day of creation, and ground by the angels, it later descended for the wanderers in the wilderness. The mills are stationed in the third heaven, where manna is constantly being ground for the future use of the pious; for in the future world manna will be set before them. Manna deserves its name, "bread of the angels," not only because it is prepared by them, but because those who partake of it become equal to the angels in strength, and, furthermore, like them, have no need of easing themselves, as manna is entirely dissolved in the body. Not until they sinned, did they have to ease themselves like ordinary mortals.