Musnad Abu Ya'la al-Mawsili 243:99

Abu Kuraib narrated to us, Abu Usamah narrated to us, Burayd narrated to us, from Abu Burdah, from Abu Musa, who said: I entered upon the Messenger of Allah (may Allah bless him and grant him peace), along with two men from my cousins. One of the two men said: "O Messenger of Allah, appoint us over some of what Allah has entrusted to you." The other said the same. He (the Prophet) said: "By Allah, we do not appoint to this work anyone who asks for it, nor anyone who is eager for it."