Sahih Muslim
Pertaining To The Charateristics Of The Hypocrites And Command Concerning Them (Kitab Sifat Al-Munafiqin Wa Ahkamihim)
Book Number: 038 / Hadith Number: 6692
Jabir b. Abdullah reported Allah's Messenger (may peace be upon him) as saying: He who would climb this hill of Murar. The rest of the hadith is the same but with this variation that it was a desert Arab who was finding out his lost thing.