As a Christian, you need not dread the Law. If you are in Christ, the Law will not bite you (see Rom. 8:1). So take hold of it and do what Jesus did in Mark 10:17. Let the world know that lust is adultery in God’s sight (see Matt. 5:27,28), and that a holy God considers hatred to be murder (see 1 John 3:15). Use the Ten Commandments as Paul did when he personalized them for his hearers: “You who preach that a man should not steal, do you steal? You who say, ‘Do not commit adultery,’ do you commit adultery? You who abhor idols, do you rob temples?” (Rom. 2:21,22, emphasis added).
When we cast down the rod of the Law, it helps to convince the lost that the gospel of salvation is from God. Once they are “convicted by the law as transgressors” (James 2:9), they are ready for the good news of the gospel—that they can be saved from its bite because the rod has already struck the Savior for our jus- tification. The Law’s holy demands have been satisfied in Christ. In Exod. 17:5, when Moses used his rod to strike a rock, water gushed out. The New Testament tells us that “that rock was Christ” (1 Cor. 10:4). Jesus had to be struck by Moses before we could freely drink of the water of life (see John 7:37,38).
“The true function of the Law is to accuse and to kill; but the function of the gospel is to make alive.” Martin Luther
Exodus 7:9 “When Pharaoh speaks to you, saying, ‘Show a miracle for yourselves,’ then you shall say to Aaron, “Take your rod and cast it before Pharaoh, and let it become a serpent.’ ” 10 So Moses and Aaron went in to Pharaoh, and they did so, just as the Lord commanded. And Aaron cast down his rod before Pharaoh and before his servants, and it became a serpent. 11 But Pharaoh also called the wise men and the sorcerers; so the magicians of Egypt, they also did in like manner with their enchantments. 12 For every man threw down his rod, and they became serpents. But Aaron’s rod swallowed up their rods.