And even now, in all that place, this manna comes down in rain, [4] according to what Moses then obtained of God, to send it to the people for their sustenance.

Now the Hebrews call this food manna: for the particle man, in our language, is the asking of a question.
What is this?
So the Hebrews were very joyful at what was sent them from heaven.

Now they made use of this food for forty years, or as long as they were in the wilderness.
7.

As soon as they were removed thence, they came to Rephidim, being distressed to the last degree by thirst; and while in the foregoing days they had lit on a few small fountains, but now found the earth entirely destitute of water, they were in an evil case.

They again turned their anger against Moses; but he at first avoided the fury of the multitude, and then betook himself to prayer to God, beseeching him, that as he had given them food when they were in the greatest want of it, so he would give them drink, since the favor of giving them food was of no value to them while they had nothing to drink.