'Causeless' in the Bible

That this shall be no grief unto thee, nor offence of heart unto my lord, either that thou hast shed blood causeless, or that my lord hath avenged himself: but when the LORD shall have dealt well with my lord, then remember thine handmaid.

And the king saith to him, 'Do as he hath spoken, and fall upon him, and thou hast buried him, and turned aside the causeless blood which Joab shed, from off me, and from off the house of my father;

As the bird by wandering, as the swallow by flying, so the curse causeless shall not come.