Midrash sur Chroniques 2 12:8

Another interpretation: It should not have said: FROM THE HEAVENS, but "From the earth," because their bread customarily comes up only from the earth.⁶⁸See Tanh., Exod. 4:20; cf. Exod. R. 25:2. But this text is related (to Ps. 135:6): WHATEVER THE LORD DESIRES HE DOES…. When he wished <to do so>, he divided the sea before Israel and made it dry land; and when he wished <to do so> he made it a sea. The custom of heaven is to bring down dew and rain and for the earth to bring forth bread, as stated (in Job 28:5): AS FOR THE EARTH, OUT OF IT COMES FORTH BREAD. But when he wished <to do so>, he brought down the bread from the heavens, as stated (in Exod. 16:4): BEHOLD, I WILL RAIN DOWN BREAD < FROM THE HEAVENS> FOR YOU…. And the dew goes up from the earth, as stated (in Exod. 16:14): WHEN THE LAYER OF DEW HAD GONE UP. This text is related (to II Chron. 12:8): NEVERTHELESS, THEY SHALL BE {MY} [HIS] SERVANTS…. But they were not servants to Nebuchadnezzar, as stated (in Dan. 1:6): NOW AMONG THOSE FROM THE CHILDREN OF JUDAH WERE DANIEL, < HANANIAH, MISHAEL, AND AZARIAH >…. What did he do for them? (Vs. 5): THE KING APPOINTED FOR THEM [A DAILY PORTION]…. But when you brought down manna for them, it came down just as the rain comes down, for there was no limit to it. Thus (according to Exod. 16:4) I rained DOWN [BREAD FROM THE HEAVENS FOR YOU].