Charles Spurgeon Commentary Exodus 16:4

"Then said Jehovah unto Moses, Behold, I will rain bread from heaven for you; and the people shall go out and gather a day`s portion every day, that I may prove them, whether they will walk in my law, or not." — Exodus 16:4 (ASV)

See God's answer to man's murmuring. They send up their complaint, and he promises to rain bread down from above. It is a blessed story on God's part all along; a rain of mercy for a smoke of complaining.