Galatians 3:13, Christ redeemed us from the curse of the law by becoming a curse for us—for it is written, “Cursed is everyone who is hanged on a tree.”
What is the curse of the Law? The Law is good, for it tells us how to live as God’s holy people before Him and before others. It is also good because it reveals to us our sin—it makes known to us the problem of fallen humanity and creation. Yet because it demands perfection, it also curses us to death because we cannot be perfect before God or man. The consequences of this imperfection—of sin—is death (Romans 6:23). Not just bodily death, but also death in Hell. That was our curse.
But Christ took this curse upon Himself on the cross. He took the full punishment of the Law and was delivered into the angry hand of God. He descended into Hell for us. This is what the Law requires of our imperfection, but the perfect God came down in Christ and redeemed us from this curse. He placed our imperfection upon Himself and suffered the curse of the Law. He was cursed to death for us.
The Lutheran Column 