'Joined' in the Bible

Ahithophel responded, "Go inside and have sex with your father's mistresses, whom he left to keep the palace in order. Then everyone in Israel will hear how your father has come to hate you and everyone who has joined you will be emboldened to act."

One day while the Philistine army was camping in the valley of giants, three of the 30 leaders joined David at the cave of Adullam.