What does the Bible say about murder?

The command 'Thou shalt not kill' encompasses more than just the physical act of murder. According to Matthew 5:21-26, Jesus clarifies that anger towards a brother without cause constitutes murder in God's eyes. This brings the spiritual nature of the law to the forefront, indicating that anyone who harbors hatred or contempt violates the commandment. As 1 John 3:17 emphasizes, 'Whosoever hateth his brother is a murderer.' Thus, the sin of murder extends to any action or attitude that disregards the life and dignity of others, including anger, envy, and slander.