Exodus 9:27 says, And Pharaoh sent, and called for Moses and Aaron, and said unto them, I have sinned this time: the LORD is righteous, and I and my people are wicked.  Pharaoh once more sent for Moses and Aaron.  This time Pharaoh acknowledged the truth, and that was that his people and he had sinned against God.  We need to remember that it was not just Pharaoh, but the people of Egypt as well who were afraid of the Israelites becoming too powerful.  Though the leaders of the world today may call for Christians to be persecuted, it is often just the people of the world themselves who persecute them without the government endorsing it.  Verse twenty-eight states, Intreat the LORD (for it is enough) that there be no more mighty thunderings and hail; and I will let you go, and ye shall stay no longer.  Pharaoh again asked for Moses and Aaron to speak to God on his behalf.  He said he had endured enough and he would let the Israelites go.  If we ask for God to help us, we need to be sincere in our promise to do what He wants us to do.  Verse twenty-nine declares, And Moses said unto him, As soon as I am gone out of the city, I will spread abroad my hands unto the LORD; and the thunder shall cease, neither shall there be any more hail; that thou mayest know how that the earth is the LORD’s.  What Moses told Pharaoh he would do to stop the storm should have proven beyond a doubt that God was the One causing the storms.  We do not have such a sign today, but God will still make Himself know to everyone in a way that cannot be denied other than by refusal to believe.  Verse thirty adds, But as for thee and thy servants, I know that ye will not yet fear the LORD God.  Moses said he would do what Pharaoh asked, even though he knew that Pharaoh and the Egyptians still did not believe God.  Verse thirty-one says,  And the flax and the barley was smitten: for the barley was in the ear, and the flax was bolled.  Then verse thirty-two adds, But the wheat and the rie were not smitten: for they were not grown up.  Though the Egyptians had lost part of their crops, they had not lost everything.  Ultimately, sin will cost us everything that we gain by it, though we may not lose everything in this life.  Verse thirty-three states, And Moses went out of the city from Pharaoh, and spread abroad his hands unto the LORD: and the thunders and hail ceased, and the rain was not poured upon the earth. Moses did what he told Pharaoh he would do, and God did as Moses asked.  When we act on God's behalf, knowing we are following His will, then He will answer our prayers.  Verse thirty-four declares, And when Pharaoh saw that the rain and the hail and the thunders were ceased, he sinned yet more, and hardened his heart, he and his servants.  Once God did what He said He would do, the Egyptians and Pharaoh once again hardened their hearts.  Verse thirty five concludes, And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the LORD had spoken by Moses.  Pharaoh again refused to let the children of Israel go.  We should never make a commitment to God when we need His help and then refuse to follow through once He has delivered us from the problem.