Sayyiduna Ali (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "O Ali, if you become ruler after me, expel the people of Najran from the Arabian Peninsula."
Ahmad recorded it; its chain contains a narrator named Qays whose lineage is not stated; apparently he is Qays bin al-Rabi', who is da'if (weak), though Shu'bah and al-Thawri declared him thiqah (trustworthy), and the rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الخلافة / 8947
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه احمد فى المسند (661) ، أخرجه مسند أحمد برقم: 663»