Verses with the word murderers in the Old Testament (3 verses):

2 Kings 14:6
But the children of the murderers he slew not: according unto that which is written in the book of the law of Moses, wherein the LORD commanded, saying, The fathers shall not be put to death for the children, nor the children be put to death for the fathers; but every man shall be put to death for his own sin.

Isaiah 1:21
How is the faithful city become an harlot! it was full of judgment; righteousness lodged in it; but now murderers.

Jeremiah 4:31
For I have heard a voice as of a woman in travail, and the anguish as of her that bringeth forth her first child, the voice of the daughter of Zion, that bewaileth herself, that spreadeth her hands, saying, Woe is me now! for my soul is wearied because of murderers.