Sh'mot (Exo) 16:3-4

The people of Isra’el said to them, “We wish ADONAI had used his own hand to kill us off in Egypt! There we used to sit around the pots with the meat boiling, and we had as much food as we wanted. But you have taken us out into this desert to let this whole assembly starve to death!” ADONAI said to Moshe, “Here, I will cause bread to rain down from heaven for you. The people are to go out and gather a day’s ration every day. By this I will test whether they will observe my Torah or not.