Psalms 37:15

Their sword shall enter into their own heart, and their bows shall be broken.

When the wicked set themselves against God's people, their weapons are made to fail. The sword lifted to strike is broken and left powerless in the hand of the attacker. By that breaking the intended killing is prevented, so the assault cannot accomplish its purpose. This is what Psalm 37:14-15 reveals about the outcome of violence aimed at the righteous.