1 Kings 1:10-14

10but he did not invite Nathan the prophet or Benaiah or the mighty men or Solomon his brother.

11Then Nathan said to Bathsheba the mother of Solomon, "Have you not heard that Adonijah the son of Haggith has become king and David our lord does not know it?

12Now therefore come, let me give you advice, that you may save your own life and the life of your son Solomon.

13Go in at once to King David, and say to him, 'Did you not, my lord the king, swear to your servant, saying, "Solomon your son shall reign after me, and he shall sit on my throne"? Why then is Adonijah king?'

14Then while you are still speaking with the king, I also will come in after you and confirm your words."