Exodus 21:14

But if a man come presumptuously upon his neighbor, to slay him with guile, if he has deliberately planned the crime and carried it out in cold blood, thou shalt take him from Mine altar that he may die; in that case it would not even avail the murderer to seek the refuge of the sanctuary. Because he has broken down the sacred wall which protected his neighbor, therefore it would also, in his case, not be a violation of the altar of God to tear him away from its protection and put him to death.