'Join' in the Bible

During the thirty-sixth year of Asa's reign, King Baasha of Israel invaded Judah and interdicted Ramah by building fortifications around it so no one could enter or leave to join King Asa of Judah.

King Ahab of Israel asked King Jehoshaphat of Judah, "Will you join me in attacking Ramoth-gilead?"

"I'm with you," Jehoshaphat replied. "and my army is with you. We'll join you in the battle." But then Jehoshaphat asked the king of Israel, "Please ask for a message from the LORD, first."