It is narrated from Sha'bi, he says: In his will, Sayyiduna Umar bin Khattab (may Allah be pleased with him) had written that none of my appointed officials should remain in their responsibility for more than one year; however, you should keep Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) in his responsibility for four years.
Hadith Referenceالفتح الربانی / 11958
Hadith Gradingمحدثین:ضعیف
Hadith Takhrij«اثر ضعيف الاسناد لضعف مجالد، وھشيمُ بن بشير مدلس وقد عنعنه، والشعبي لم يدرك عمر ، (انظر مسند أحمد ترقيم الرسالة: 19490 ترقیم بيت الأفكار الدولية: 19719»