Hadithcore
Sahih Muslim, 2780 b
sahih

Jabir b. Abdullah reported Allah's Messenger (ﷺ) 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.

وَحَدَّثَنَاهُ يَحْيَى بْنُ حَبِيبٍ الْحَارِثِيُّ، حَدَّثَنَا خَالِدُ بْنُ الْحَارِثِ، حَدَّثَنَا قُرَّةُ، حَدَّثَنَا أَبُو الزُّبَيْرِ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏

‏ مَنْ يَصْعَدُ ثَنِيَّةَ الْمُرَارِ أَوِ الْمَرَارِ ‏

‏ ‏.‏ بِمِثْلِ حَدِيثِ مُعَاذٍ غَيْرَ أَنَّهُ قَالَ وَإِذَا هُوَ أَعْرَابِيٌّ جَاءَ يَنْشُدُ ضَالَّةً لَهُ ‏.‏

References2 variants
In-Book Reference
Book 51, Hadith 16
USC-MSA web (English) reference
Book 38, Hadith 6692 (deprecated numbering scheme)