Musnad Abu Ya'la al-Mawsili 42:55

Abu Bakr narrated to us, Muhammad bin Bishr narrated to us, Zakariya narrated to us, ‘Atiyyah narrated to me, from Abu Sa’id, that the Prophet (ﷺ) said: "Indeed, I have a Hawd (basin/cistern) whose length is [the distance] between the Ka’bah and Bayt al-Maqdis (Jerusalem). It is whiter than milk, and its vessels are [in number] like the stars. And I will have the most followers among the Prophets on the Day of Resurrection."