Sahih Muslim Book 030, Hadith Number 5680.
Hadith Section/Book: Sahih Muslim Sahih Muslim Book 30. The Excellent Qualities Of The Holy Prophet (PBUH) And His Companions
Chapter : The cistern of our Apostle (may peace be upon him) and its characteristics.
Jundab reported: I heard Allah's Messenger (may peace be upon him) as saying: I shall be there at the Cistern before you.