Kings III 1:13

13 Haste, and go in to king David, and thou shalt speak to him, saying, Hast not thou, my lord, O king, sworn to thine handmaid, saying, Thy son Solomon shall reign after me, and he shall sit upon my throne? why then does Adonias reign?

Kings III 1:13 In-Context

11 And Nathan spoke to Bersabee the mother of Solomon, saying, Hast thou not heard that Adonias the son of Aggith reigns, and our lord David knows it not?
12 And now come, let me, I pray, give thee counsel, and thou shalt rescue thy life, and the life of thy son Solomon.
13 Haste, and go in to king David, and thou shalt speak to him, saying, Hast not thou, my lord, O king, sworn to thine handmaid, saying, Thy son Solomon shall reign after me, and he shall sit upon my throne? why then does Adonias reign?
14 And behold, while thou art still speaking there with the king, I also will come in after thee, and will confirm thy words.
15 So Bersabee went in to the king into the chamber: and the king was very old, and Abisag the Somanite was ministering to the king.

The Brenton translation of the Septuagint is in the public domain.