‘Abdallah b. Mas'ud reported God’s Messenger as saying, “No judge who pronounces judgment among men will fail to come on the day of resurrection with an angel holding the back of his neck. He* will then raise his head to heaven, and if God gives orders to cast him down, he will cast him into an abyss forty years deep."
Ahmad, Ibn Majah, and Baihaqi in Shu'ab al-lman transmitted it.
*i.e. the angel.