Behold, this day your eyes have seen how that Yahweh had delivered you today into my hand in the cave: and some bade me kill you; but [my eye] spared you; and I said, I will not put forth my hand against my lord; for he is Yahweh's anointed.
In the previous section, Saul sought the opportunity to take David’s life. In this one (1 Samuel 23:29 to 1 Samuel 24:22), given the opportunity to take Saul’s life, David spared him.