Musnad Ahmad 30:1742

Ibrahim ibn Ishaq narrated to us, Ibn al-Mubarak narrated to us, from Yunus, from al-Zuhri, he said: Sa'id ibn al-Musayyib narrated to me, from Abu Hurayrah, from the Prophet, may God bless him and grant him peace, who said: "God will grasp the earth on the Day of Resurrection, and He will fold the heaven with His right hand, then He will say: 'I am the King; where are the kings of the earth?'"