Ex 20:13 - Thou shalt not kill.

1 John 3:15 - Whosoever hateth his brother is a murderer: and ye know that no murderer hath eternal life abiding in him.
>Hatred and murder are SINS, forbidden:

Hatred and jealousy leads to murder:
>Gen 4:5 - But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell
>Gen 4:8 - And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.

IF YOU MURDER YOU WILL BE KILLED:
>Gen 9:6 - Whoso sheddeth man's blood, by man shall his blood be shed: for in the image of God made he man.

God will avenge you, do not avenge yourself:
>Rom 12:19 - Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord

Anger is foolish:
>Eccl 7:9 - Be not hasty in thy spirit to be angry: for anger resteth in the bosom of fools.
>Prov 25:28 - He that hath no rule over his own spirit is like a city that is broken down, and without walls.

We are commanded to love and forgive our enemies:
>Matt 6:15 - But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.
>Luke 6:28 - Bless them that curse you, and pray for them which despitefully use you.

How to get saved:
https://www.youtube.com/watch?v=qJT7RbMGGJw