Musannaf Ibn Abi Shaybah 36119 — Umar (may Allah be pleased with him)

Urwah bin Ruwaym said: Sayyiduna Umar (may Allah be pleased with him) wrote a letter to Sayyiduna Abu Ubaydah bin al-Jarrah (may Allah be pleased with him), which Sayyiduna Abu Ubaydah read out to the people at Jabiyah. In it was written: "From the servant of Allah, Umar, Commander of the Faithful, to Abu Ubaydah. Peace be upon you. Only a man of clear intellect and great strength can implement the command of Allah among the people, one whose secrets people cannot discover, who does not flinch in enforcing the truth, and who does not care for the blame of any blamer in the matter of Allah. Peace be upon you."