1 Samuel 24:10-12

Mine eye spared thee A phrase signifying the taking pity on those whom we have it in our power to hurt. The eye is said to spare, because it affects the heart, and induces a person to spare. Moreover, my father Such he was through David's marriage of his daughter. The Lord avenge me of thee Rather, will avenge me; that is, vindicate and deliver me from thy violent and unjust persecution. For he does not, in these words, pray God to punish Saul for the injuries he had done him, but to justify, clear, and protect himself. But my hand shall not be upon thee He was resolved not to return evil for evil, or to avenge himself, but to leave it to God to do him right.