1 Kings 1:13, 17

Go at once to King David and say to him, ‘Have you not, my lord, O king, sworn to your maidservant, saying, “Surely Solomon your son shall be king after me, and he shall sit on my throne”? Why then has Adonijah become king?’

She said to him, “My lord, you swore to your maidservant by the LORD your God, saying, ‘Surely your son Solomon shall be king after me and he shall sit on my throne.’