John Wesley on 2 Chronicles 19:10

Blood - This refers to Deut 17:8, between the blood of the person slain, and the blood of the man - slayer. All the cities of refuge, except Hebron, now belonged to the kingdom of Israel, so that the man - slayer now usually fled to the courts of the temple, or the horns of the altar. And therefore the trial of these, was reserved for the court at Jerusalem. Law, &c. - When any debates shall arise about the meaning of any of God's laws. Warn - Ye shall not only give a righteous sentence for what is past, but ye shall admonish the offender, and others, to take better heed for the future.