1 Kings 1:51 in the King James Version
And it was told Solomon, saying, Behold, Adonijah feareth king Solomon: for, lo, he hath caught hold on the horns of the altar, saying, Let king Solomon swear unto me to day that he will not slay his servant with the sword.
Context
50 Adonijah was afraid because of Solomon; and he arose, and went, and hung onto the horns of the altar.
51 Solomon was told, “Behold, Adonijah fears King Solomon; for, behold, he is hanging onto the horns of the altar, saying, ‘Let King Solomon swear to me first that he will not kill his servant with the sword.’”
52 Solomon said, “If he shows himself a worthy man, not a hair of his shall fall to the earth; but if wickedness is found in him, he shall die.”