'Confirm' in the Bible

Behold, while thou yet talkest there with the king, I also will come in after thee, and confirm thy words.

Benaiah son of Jehoiada responded to the king: "So be it! May the Lord God of my master the king confirm it!

that Jehovah may confirm his word which he spoke concerning me, saying, If thy sons take heed to their way, to walk before me in truth with all their heart and with all their soul, there shall not fail thee, said he, a man upon the throne of Israel.

Now Lord God of Israel,please confirm what You promisedto Your servant, my father David.