Sayyiduna Abu Musa (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) with two of my cousins. One of them said: O Messenger of Allah! Make us governors over some of what Allah has placed under your authority. The other said the same, so he (peace and blessings be upon him) said: "We do not appoint as governor one who asks for it, nor one who is eager for it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20248