2 Samuel 15:9-11

Amplified Bible

⁹ And [David] the king said to him, “Go in peace.” So he arose and went to Hebron. ¹⁰ But Absalom sent spies throughout all the tribes of Israel, saying, “As soon as you hear the sound of the trumpet, you shall say, ‘Absalom is king in Hebron.’” ¹¹ Then two hundred men from Jerusalem who were invited [as guests to his sacrificial feast] went with Absalom. They went innocently and knew nothing [about his plan against David].