Kings III 2:23

23 And king Solomon swore by the Lord, saying, God do so to me, and more also, that Adonias has spoken this word against his own life.

Kings III 2:23 In-Context

21 And she said, Let, I pray thee, Abisag the Somanite be given to Adonias thy brother to wife.
22 And king Solomon answered and said to his mother, And why hast thou asked Abisag for Adonias? ask for him the kingdom also; for he my elder brother, and he has for his companion Abiathar the priest, and Joab the son of Saruia the commander-in-chief.
23 And king Solomon swore by the Lord, saying, God do so to me, and more also, that Adonias has spoken this word against his own life.
24 And now the Lord lives who has established me, and set me on the throne of my father David, and he has made me a house, as the Lord spoke, this day shall Adonias be put to death.
25 So king Solomon sent by the hand of Banaeas the son of Jodae, and he slew him, and Adonias died in that day.

Footnotes 1

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