Then Absalom sent spies throughout all the tribes of Israel, saying, "As soon as you hear the sound of the trumpet, then you shall say, "Absalom reigns in Hebron!"'
2 Samuel 15:10
Surrounding context
15:9 And the king said to him, "Go in peace." So he arose and went to Hebron.
15:10 Then Absalom sent spies throughout all the tribes of Israel, saying, "As soon as you hear the sound of the trumpet, then you shall say, "Absalom reigns in Hebron!"'
15:11 And with Absalom went two hundred men invited from Jerusalem, and they went along innocently and did not know anything.