'Knows' in the Bible

Yet David vowed again, saying, “Your father knows well that I have found favor in your sight, and he has said, ‘Do not let Jonathan know this, or he will be grieved.’ But truly as the Lord lives and as your soul lives, there is hardly a step between me and death.”

Did I just begin to inquire of God for him today? Far be it from me! Do not let the king impute anything to his servant or to any of the household of my father, for your servant knows nothing at all of this whole affair.”

Thus he said to him, “Do not be afraid, because the hand of Saul my father will not find you, and you will be king over Israel and I will be next to you; and Saul my father knows that also.”