I Kings 1:13, 17

Go immediately to King David and say to him, ‘Did you not, my lord, O king, swear to your maidservant, saying, “Assuredly your son Solomon shall reign after me, and he shall sit on my throne“? Why then has Adonijah become king?’

Then she said to him, “My lord, you swore by the LORD your God to your maidservant, saying, ‘Assuredly Solomon your son shall reign after me, and he shall sit on my throne.’