Jesus quotes what was commanded long ago from Exodus 20:13:
“You shall not murder.”
Seems to be a pretty clear cut command. But Jesus adds to this command by saying that even if you find yourself angry at a brother or sister you are subject to punishment.
In fact, Jesus says if you are offering a gift at the altar but have something against a brother, drop the gift and take care of the brokenness between you and the individual. Then you can come and offer your gift to God.
Jesus says to settle matters quickly or you could be handed over to the judge, who hands you over to the officer, who throws you in prison.
I believe the point of this teaching from Jesus is to show us that relationships should be very important to us. Reconciliation and forgiveness should be important to us…why? Because Jesus has forgiven us and reconciled with us. If we are to be the image of God, we must be willing to forgive and move on as He does.
Is there someone you are angry with that you need to forgive today? Let God live through you today and go and reconcile with that person. It’s important to God that you do so.
A Journey With Jesus 