There was once a truly just judge. All over the land people recognize him as a truly just person.
One day the judge was sad to find out that his son committed a crime. His son just injured another person because of a fight. But since he was the judge he had to hear the arguments against his son. And based on the evidence his son was indeed guilty without a shadow of a doubt. His son will have to receive twenty lashes for the crime.
The judge hands out the punishment of his son and orders the soldiers to give out twenty lashes on his back. His son takes off his shirt as the lashing will begin and the soldier gets ready to do his job. The soldier then was surprised as the judge stood up and approached his son. The judge takes off his robe and covers his son with now the judge's back facing the soldier.
He orders the soldier to begin the punishment as he covers his son.
God is like the just judge who sacrificied his son so that we can escape the puishment. If only we would accept this gift of salvation we too will escape the punishment. His mercy and love is truly great.
"For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life." (John 3:16)
"God made him who had no sin to be sin for us, so that in him we might become the righteousness of God." (2 Corinthians 5:21)
"He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world." (1 John 2:2)