Didst thou not, O king, swear unto thy handmaid? We do not read anywhere else of this oath: but, no doubt, David had solemnly sworn to her that he would make her son his successor, knowing that God himself had designed him to that honour. And it is probable that Adonijah was not an entire stranger to what God had declared to Nathan and David on this subject: and if so, his crime was the greater in setting himself to oppose the decree of heaven. Indeed he acknowledges as much, 1 Kings 2:15. The king was very old And therefore, probably, could not see so as to discern who had entered the chamber till Abishag, who ministered unto him, informed him.
Related Commentaries of 1 Kings 1:13
1 Kings 1:13-15
13 Go and get thee in unto king David, and say unto him, Didst not thou, my lord, O king, swear unto thine handmaid, saying, Assuredly Solomon thy son shall reign after me, and he shall sit upon my throne? why then doth Adonijah reign?
14 Behold, while thou yet talkest there with the king, I also will come in after thee, and confirmd thy words.
15 And Bathsheba went in unto the king into the chamber: and the king was very old; and Abishag the Shunammite ministered unto the king.