Musannaf Ibn Abi Shayba 28:16

Waki' narrated to us, he said: Sufyan narrated to us, from Muhammad ibn al-Munkadir, he said: Al-Abbas said: "O Messenger of Allah, will you not employ me?" He said: "O Abbas, O uncle of the Messenger of Allah, a soul that you save is better than an emirate that you cannot count."