Exodus 10:12 says, And the LORD said unto Moses, Stretch out thine hand over the land of Egypt for the locusts, that they may come up upon the land of Egypt, and eat every herb of the land, even all that the hail hath left.  God sent locusts to destroy the rest of the crops.  Just like the Egyptians and Pharaoh, we might not lose everything at once when we go against God's will, we will lose everything gained that way eventually.  Verse thirteen states, And Moses stretched forth his rod over the land of Egypt, and the LORD brought an east wind upon the land all that day, and all that night; and when it was morning, the east wind brought the locusts.  Once again, God waited until the next day to send the plague.   Pharaoh could have still changed his mind and have let the Israelites go.   We can be sure that God will always give everyone ample opportunity to respond to His gift of salvation.  Verse fourteen declares, And the locusts went up over all the land of Egypt, and rested in all the coasts of Egypt: very grievous were they; before them there were no such locusts as they, neither after them shall be such.  There was an unprecedented swarm of locusts.  There will come an unprecedented punishment for those who do not accept the free gift of salvation.  Verse fifteen adds, For they covered the face of the whole earth, so that the land was darkened; and they did eat every herb of the land, and all the fruit of the trees which the hail had left: and there remained not any green thing in the trees, or in the herbs of the field, through all the land of Egypt.   We would think that Pharaoh would have believed God by now, but he still didn't.  Some people today refuse to believe God, no matter how much evidence they are confronted with.  Verse sixteen declares, Then Pharaoh called for Moses and Aaron in haste; and he said, I have sinned against the LORD your God, and against you.  Pharaoh once again called Moses and Aaron and confessed his sin, but there was really no sincerity to his confession.  When in a bad situation today, many people will call on God and make any promise, but as soon as the problem goes away, they forget their promise.  Verse seventeen adds, Now therefore forgive, I pray thee, my sin only this once, and intreat the LORD your God, that he may take away from me this death only.  Pharaoh asked Moses and Aaron to forget His sin this one time and ask God for His forgiveness.  I believe the implication was that he wouldn't sin again.  Verse eighteen states, And he went out from Pharaoh, and intreated the LORD.  Moses once again prayed to God for Pharaoh.  I am not sure that Moses believed Pharaoh, but I believe that his prayer was sincere.  We may not have a lot of confidence in a person's declaration of faith and their asking us to pray for their forgiveness, but we must be sincere when we pray if they ask us to.  Pharaoh's obedience was between him and God and was not up to Moses to judge.  Verse nineteen declares, And the LORD turned a mighty strong west wind, which took away the locusts, and cast them into the Red sea; there remained not one locust in all the coasts of Egypt. God granted Moses' prayer for Pharaoh and got rid of all the locusts.  When we ask God for salvation through Jesus Christ, He gets rid of all our sins.  Verse twenty concludes, But the LORD hardened Pharaoh’s heart, so that he would not let the children of Israel go.  Pharaoh once again failed to live up to his promise to God, just as some people today refuse to live up to promises made to God simply to get out of a bad situation.