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Exodus 16:4
Then said the Lord unto Moses, Behold, I will rain bread from heaven for you; and the people shall go out and gather a certain rate every day, that I may prove them, whether they will walk in my law, or no. (Exodus 16:4)
I will rain bread.
The patience and kindness of God toward His chosen people in these instances of murmuring is remarkable. Recognizing that their minds were still as servile and their faith as undeveloped as when they were in Egypt, God did not show Himself offended at their murmuring but sent help each time they were in trouble. In so doing it was His purpose to train them to trust their divinely appointed leaders and to have faith in Him.
 The phenomenon described here and elsewhere in the Bible (Deut. 8:3; Neh. 9:15; Ps. 78:23-25; 105:40; John 6:31) can be satisfactorily accounted for only as a miracle. The explanation of certain modern Bible expositors that the “manna” (Ex. 16:15) was the secretion of various plant lice is preposterous. Examining this so-called “manna” in 1927, F. S. Bodenheimer, of the Hebrew University of Jerusalem, found that various plant lice, cicadas, and scale insects feed on the tamarisk trees of the Sinai wilderness and excrete their excess carbohydrates in the form of honeydew drops. The latter evaporate into particles resembling hoar frost. This is supposed to be the “manna” that Josephus (Antiquities iii. 1. 6) said was still found on Sinai in his time. Acceptance of the narrative of Ex. 16 precludes the possibility that the “manna” of the tamarisk can have been the miraculous food on which the Israelites lived for 40 years. The heavenly manna was provided throughout the year, but ceased as soon as they entered the Promised Land (Joshua 5:12). The tamarisk “manna” is found on Sinai only during the months of June and July. The quantity of this plant “manna” is extremely small and could not possibly serve to feed many people, whereas God fed a whole nation with His manna for almost 40 years. Furthermore, the Biblical manna could not be preserved even to the next day, except on Sabbath (Ex. 16:19, 20), but could be baked (v. 23). In contrast, tamarisk “manna” can be kept for several days, but cannot be used for baking purposes, though it can be cooked. These points of difference show that acceptance of the modern interpretation, which explains the manna as a natural product of Sinai, means rejection of the Biblical record. This and other modern explanations, all of which are made with the purpose of escaping anything of a miraculous nature, do not deserve further consideration.
That I may prove them.
That the rain of manna was designed by God as a means of education is apparent from these words. The miraculous provision of food was to train the people to respect and obey His holy law.