Musnad Ahmad 30:1301

Surayj narrated to us, he said: Fulayh narrated to us, from Hilal ibn Ali, from Ata ibn Yasar, from Abu Hurayrah, he said: The Messenger of Allah, peace and blessings of Allah be upon him, said—and he mentioned it—and he said: "And above it is the Throne of the Most Merciful, and from it gush forth the rivers of Paradise."