MURDER

God forbids the unjustified taking of a human life. In the King James Version of Scripture, Exodus 20:13 says 'Thou shalt not kill'. 

The New King James Version correctly translates it as ... 'You shall not murder'. 

In the original Hebrew, there are two different words for 'kill'. One means 'put to death' (ratsakh) and the other means 'murder' (mut). God used the latter designation in the Ten Commandments ... When He had finished speaking with him on Mount Sinai, He gave Moses the two tablets of the Testimony, tablets of stone, written with the finger of God. (Exodus 31:18)

If we suppose that the intended meaning of 'thou shalt not kill' was absolute, it would render all of Israel's God-endorsed bloodshed a violation of that command. Since the Lord would not break His own law ... the verse is not a call for a complete moratorium on the taking of human life.

1. There was the right to take the life of an evildoer (capital punishment) ... But if a man acts intentionally against another and kills him by [design through] treachery, you are to take him from My altar [to which he may have fled for protection], so that he may be put to death. (Exodus 21:14)

2. Another instance of acceptable 'killing' was during times of war ... But of the cities of these peoples which the Lord your God gives you as an inheritance, you shall let nothing that breathes remain alive, but you shall utterly destroy them: the Hittite and the Amorite and the Canaanite and the Perizzite and the Hivite and the Jebusite, just as the Lord your God has commanded you. (Deuteronomy 20:16-17)

3. And the 'unintentional' killing of someone (manslaughter) happened often enough that cities of refuge were designated for the offender to seek refuge ... Then the Lord said to Joshua: “Tell the Israelites to designate the cities of refuge, as I instructed you through Moses, so that anyone who kills a person accidentally and unintentionally may flee there and find protection from the avenger of blood. (Joshua 20:1-3). 

So what the Lord forbids in the Ten Commandments is 'murder', the malicious (intentional) taking of someone's life. 

But know this, pilgrim. In God's eyes, murder is more than just the physical act ... Whoever hates his brother is a murderer, and you know that no murderer has eternal life abiding in him. (1 John 3:15)

Harboring hatred in your heart is unacceptable. When you stubbornly hold on to feelings of resentment or disdain toward another, you cripple your walk of faith. 

Recognize it, confess it, repent of it, and then ... allow 'grace' to guide your way.