'Knoweth' in the Bible

and David knoweth that Jehovah hath established him for king over Israel, and that He hath lifted up his kingdom, because of His people Israel.

And he saith, 'While the lad is alive I have fasted, and weep, for I said, Who knoweth? -- Jehovah doth pity me, and the lad hath lived;

And Joab son of Zeruial knoweth that the heart of the king is on Absalom,

And Joab fell to the ground on his face, and bowed himself, and thanked the king: and Joab said, To day thy servant knoweth that I have found grace in thy sight, my lord, O king, in that the king hath fulfilled the request of his servant.

And he also that is valiant, whose heart is as the heart of a lion, shall utterly melt: for all Israel knoweth that thy father is a mighty man, and they which be with him are valiant men.