2 Samuel 16:15
"And Absalom, and all the people the men of Israel, came to Jerusalem, and Ahithophel with him."
Cross References (ranked by relevance)
2 Samuel 15:37
So Hushai David’s friend came into the city, and Absalom came into Jerusalem.
2 Samuel 15:12
And Absalom sent for Ahithophel the Gilonite, David’s counsellor, from his city, even from Giloh, while he offered sacrifices. And the conspiracy was strong; for the people increased continually with Absalom.