1 John 3:15
Every person who hates his brother is a murderer [in God's sight]; and you [surely] know that no murderer has [the hope of] never ending life remaining in his heart.
Matthew 18:15
"And if your brother sins against you, go and show him where he wronged you, [but] keep it between just the two of you. If he listens to you [i.e., accepts your reasoning and repents], you have won your brother [back].
Ephesians 4:26
[Psa. 4:4 says], "Be angry [i.e., at wrongdoing. See Mark 3:5], but do not sin" [i.e., by harboring bitterness or retaliation]. Do not allow the sun to go down while you are still provoked.
Ephesians 4:31
So, put away from you all [kinds of] bitterness and anger and wrath and brawling and slander, along with all [kinds of] malice [i.e., bad attitudes],
1 John 2:9
The person who claims to be living in [harmony with] the light [i.e., by obeying God's truth], and [yet] hates his brother is still [living] in the darkness [of sin].
1 John 2:11
But the person who hates his brother is in the darkness [of sin] and he lives in [harmony with] that darkness, and he does not know where he is heading, because the darkness [of sin] has blinded his eyes [to his spiritual condition].