For everyone who curses his father or his mother shall surely be put to death. He has cursed his father or his mother. His blood shall be upon him. – Leviticus 20:9
The murder of children because of their cursing of parents? How can this behavior be even remotely justifiable? Since when can anything verbal justify the killing of an individual? Who cares if this is listed in the Old Testament. How was this ever moral? Why did God ever allow this type of behavior?
There is a commandment that forbids killing, a good illustration of the way moral standards change over time in the Bible. The implication is obvious.