1 Kings 1:10-14

10but he did not invite Nathan the prophet or Benaiah or the special guard or his brother Solomon.

11Then Nathan asked Bathsheba, Solomon’s mother, “Have you not heard that Adonijah, the son of Haggith, has become king, and our lord David knows nothing about it?

12Now then, let me advise you how you can save your own life and the life of your son Solomon.

13Go in to King David and say to him, ‘My lord the king, did you not swear to me your servant: “Surely Solomon your son shall be king after me, and he will sit on my throne”? Why then has Adonijah become king?’

14While you are still there talking to the king, I will come in and add my word to what you have said.”