From Sahih Bukhari (Hadith 6580):
Narrated Anas bin Malik:Allah's Messenger (ﷺ) said, "The width of my Lake-Fount is equal to the distance between Aila (a town in Sham) and Sana' (the capital of Yemen) and it has as many (numerous) jugs as the number of stars of the sky
Reference: Bukhari 6580