Sahih Muslim , Book 43, Hadith 215 (In-Book) ⓘ
Anas b. malik reported Allah's Messenger as saying: I came. And in the narration transmitted on the authority of Haddib (the words are): I happened to pass by Moses on the occasion of the Night journey near the red mound (and found him) saying his prayer in his grave.
حَدَّثَنَا هَدَّابُ بْنُ خَالِدٍ، وَشَيْبَانُ بْنُ فَرُّوخَ، قَالاَ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، عَنْ ثَابِتٍ، الْبُنَانِيِّ وَسُلَيْمَانَ التَّيْمِيِّ عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " أَتَيْتُ - وَفِي رِوَايَةِ هَدَّابٍ مَرَرْتُ - عَلَى مُوسَى لَيْلَةَ أُسْرِيَ بِي عِنْدَ الْكَثِيبِ الأَحْمَرِ وَهُوَ قَائِمٌ يُصَلِّي فِي قَبْرِهِ " .
also referenced under: Hadith 2375 (Reference) & Book 30, Hadith 5858 (USC-MSA)