Musannaf Ibn Abi Shayba 23:176

Abu Dawud Umar ibn Sa'd narrated to us, from Badr ibn Uthman, from Ubayd Allah ibn Marwan, from Abu A'isha, from Ibn Umar, who said: The Messenger of Allah (may Allah bless him and grant him peace) came out to us one morning and said: "I have just seen that I was given the scales and the keys. As for the keys, they are these keys, and as for the scales, they are those with which you weigh. I was placed in a scale pan and my nation was placed in a scale pan, and I outweighed them. Then Abu Bakr was brought and he outweighed them. Then Umar was brought and he outweighed them. Then Uthman was brought and he outweighed them." Then he said: "It was raised." A man said to him: "Where are we?" He said: "Where you have placed yourselves."