Musnad Ahmad 26:817

Yunus narrated to us, Shaiban narrated to us, from Mansur ibn al-Mu'tamir, from Ibrahim, from 'Ubaydah al-Salmani, from Abdullah ibn Mas'ud, who said: A rabbi came to the Messenger of Allah, peace and blessings of Allah be upon him, and said: "O Muhammad," or "O Messenger of Allah, indeed Allah, the Almighty and Majestic, on the Day of Resurrection, will place the heavens upon a finger, the earths upon a finger, the mountains upon a finger, the trees upon a finger, the water and the soil upon a finger, and the rest of the creation upon a finger, then He will shake them and say: 'I am the King.'" He said: "The Messenger of Allah, peace and blessings of Allah be upon him, laughed until his molars appeared, in confirmation of the rabbi's statement." Then he recited: "And they have not appraised Allah with true appraisal, while the earth entirely will be within His grip on the Day of Resurrection" [Az-Zumar: 67], until the end of the verse.