And he went out from Pharaoh,.... Without the city, as he had been wont to do: and entreated the Lord; prayed to him that he would remove the plague of the locusts from the land.

To show the hardened king the greatness of the divine long-suffering, Moses prayed to the Lord, and the Lord cast the locusts into the Red Sea by a strong west wind. The expression "Jehovah turned a very strong west wind" is a concise form, for "Jehovah turned the wind into a very strong west wind." The fact that locusts do perish in the sea is attested by many authorities. Gregatim sublatae vento in maria aut stagna decidunt (Pliny); many others are given by Bochart and Volney. ויּתקעהוּ: He thrust them, i.e., drove them with irresistible force, into the Red Sea. The Red Sea is called סוּף ים, according to the ordinary supposition, on account of the quantity of sea-weed which floats upon the water and lies upon the shore; but Knobel traces the name to a town which formerly stood at the head of the gulf, and derived its name from the weed, and supports his opinion by the omission of the article before Suph, though without being able to prove that any such town really existed in the earlier times of the Pharaohs.

And he went out from Pharaoh, and entreated the LORD.

10:12-20 God bids Moses stretch out his hand; locusts came at the call. An army might more easily have been resisted than this host of insects. Who then is able to stand before the great God? They covered the face of the earth, and ate up the fruit of it. Herbs grow for the service of man; yet when God pleases, insects shall plunder him, and eat the bread out of his mouth. Let our labour be, not for the habitation and meat thus exposed, but for those which endure to eternal life. Pharaoh employs Moses and Aaron to pray for him. There are those, who, in distress, seek the help of other people's prayers, but have no mind to pray for themselves. They show thereby that they have no true love to God, nor any delight in communion with him. Pharaoh desires only that this death might be taken away, not this sin. He wishes to get rid of the plague of locusts, not the plague of a hard heart, which was more dangerous. An east wind brought the locusts, a west wind carries them off. Whatever point the wind is in, it is fulfilling God's word, and turns by his counsel. The wind bloweth where it listeth, as to us; but not so as it respects God. It was also an argument for their repentance; for by this it appeared that God is ready to forgive, and swift to show mercy. If he does this upon the outward tokens of humiliation, what will he do if we are sincere! Oh that this goodness of God might lead us to repentance! Pharaoh returned to his resolution again, not to let the people go. Those who have often baffled their convictions, are justly given up to the lusts of their hearts.