John Gills Exposition of the Bible Commentary - Exodus 10:12
And the Lord said unto Moses, stretch out thine hand over the land of Egypt ,.... First one way, and then another, towards every quarter, and every part of the land, to signify that the following plague would come upon the whole land: for the locusts, that they may come up upon the land of Egypt ; the stretching out of his hand was to be the signal to them to come up and spread themselves over the land, which was brought about by the mighty power of God; for otherwise there was no such... read more
Matthew Henry's Complete Commentary - Exodus 10:12-20
Here is, I. The invasion of the land by the locusts?God's great army, Joel 2:11. God bids Moses stretch out his hand (Exod. 10:12), to beckon them, as it wee (for they came at a call), and he stretched forth his rod, Exod. 10:13. Compare Exod. 9:22, 23. Moses ascribes it to the stretching out, not of his own hand, but the rod of God, the instituted sign of God's presence with him. The locusts obey the summons, and fly upon the wings of the wind, the east wind, and caterpillars without number,... read more