Shmuel Bais 18:5-7

Orthodox Jewish Bible

⁵ And HaMelech commanded Yoav and Avishai and Ittai, saying, Deal gently for my sake with the na’ar, even with Avshalom. And kol HaAm heard when HaMelech gave all the sarim charge concerning Avshalom.

⁶ HaAm went into the sadeh against Yisroel; the milchamah was in ya’ar (forest) of Ephrayim;

⁷ Where Am Yisroel were slain before the avadim of Dovid, and there was there a magefah gedolah that day of esrim elef.