It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him): The slogan of the Muhajirun was: "Abdullah." And the slogan of the Ansar was: "Abdur Rahman."
Hadith Referenceسنن سعید بن منصور / كتاب الجهاد / 4085
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«إسناده ضعيف، وأخرجه أبو داود فى «سننه» برقم: 2595، وسعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 2909، والبيهقي فى«سننه الكبير» برقم: 13175، والبزار فى «مسنده» برقم: 4575، وابن أبى شيبة فى «مصنفه» برقم: 34264، والطبراني فى«الكبير» برقم: 6903»
Brief Explanation
Hajjaj ibn Arta’ah → Weak in memorization, and he is also a mudallis (one who practices tadlis). Hasan al-Basri → from Samurah → It is well-known about him that he narrates mursal (with a missing link) in the chain, and Hasan’s hearing from Samurah is questionable. The hadith scholars (such as Imam al-Bukhari, Ibn Ma’in, etc.) have differed regarding the continuity (ittisal) of the narration al-Hasan ‘an Samurah.