Narrated by:Anas that
It was narrated from Anas that:The Prophet (ﷺ) said: "I passed by the grave of Musa, peace be upon him, and he was praying in his grave."
أَخْبَرَنِي أَحْمَدُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا حَبَّانُ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ، قَالَ أَنْبَأَنَا ثَابِتٌ، وَسُلَيْمَانُ التَّيْمِيُّ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " مَرَرْتُ عَلَى قَبْرِ مُوسَى عَلَيْهِ السَّلاَمُ وَهُوَ يُصَلِّي فِي قَبْرِهِ " .
Nesai
The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day • Hadith 1633