عَنْ أَنَسِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ ((لَمَّا أُسْرِيَ بِي مَرَرْتُ عَلَى مُوسَى وَهُوَ قَائِمٌ يُصَلِّي فِي قَبْرِهِ عِنْدَ الْكَثِيبِ الْأَحْمَرِ))
Narrated by Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The night I was taken on the Night Journey (Isra), I passed by Musa (peace be upon him) and I saw him standing and performing prayer in his grave, which was by a red mound.