When we think of murderers, we might think of horrible people who are in jail or should be in jail. Jesus will give us a full explanation of the 6th commandment and describes what a murderer looks like.
Genesis 4:3-8
Exodus 20:13
Numbers 35:30
Luke 6:45
Mark 9:47-48
Matthew 15:19
Proverbs 4:23-24
Ephesians 4:26-27
Mark 10:17-20
James 2:10-11