The food ("bread from heaven") that God supplied the Israelites, during their forty-year sojourn through the desert, after their escape from Egypt. It came down at night, and was gathered by families each morning - only enough to last that day; no hoarding allowed, since any surplus would spoil. They would gather two days' worth before the Sabbath, so as not to have to work on that day. A container of it was kept, for remembrance, in the Ark of the Covenant. See Exodus 16; the word "manna" means "What is it?", which was the original reaction of the people upon first seeing it on the ground.