Musnad Ahmad 32:1409

Bishr ibn Shu'ayb narrated to us, he said: My father narrated to me, from al-Zuhri, he said: Anas ibn Malik informed me that the Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, in my Hawd (Cistern) are pitchers equal to the number of the stars of the sky."