Hadith 17:814
Waki’ narrated to us, he said: Ibn ‘Awn narrated to us, from Ibn Sirin, from al-Ahnaf, who said: Umar said: "Gain understanding (of the religion) before you are made leaders."
حدثنا وكيع قال حدثنا بن عون عن بن سيرين عن الأحنف قال قال عمر تفقهوا قبل أن تسودوا