Musannaf Ibn Abi Shaybah 35372 — Seeking help from polytheists: those

Sa'd bin al-Mundhir said: The Messenger of Allah (peace and blessings be upon him) set out towards Uhud. When he (peace and blessings be upon him) had left the passes of al-Wada' behind, he (peace and blessings be upon him) looked behind him, and there was a heavily armed company. He (peace and blessings be upon him) asked: "Who are these people?" The Companions (may Allah be pleased with them) said: Abdullah bin Ubayy bin Salul and his Jewish friends. He (peace and blessings be upon him) asked: "Have they accepted Islam?" The Companions (may Allah be pleased with them) said: No. He (peace and blessings be upon him) said: "We do not seek the help of disbelievers against polytheists."