Musannaf Ibn Abi Shayba 13:3019

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Isra’il narrated to us, from ‘Abd al-A’la ibn ‘Amir al-Tha’labi, from Bilal ibn Abi Burdah ibn Abi Musa, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever seeks the position of a judge is left to himself, and whoever is compelled into it, an angel descends upon him and guides him."