Musnad Abu Ya'la al-Mawsili 155:10

Al-Harith ibn Surayj narrated to us, Ibn al-Mubarak narrated to us, Yunus informed us, from al-Zuhri, from Sa'id ibn al-Musayyib, from Abu Hurayrah, from the Prophet, peace be upon him, who said: "Allah will grasp the earth on the Day of Resurrection and will fold the heaven with His right hand, then He will say: 'I am the King; where are the kings?'"