حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا غُنْدَرٌ، عَنْ شُعْبَةَ، عَنِ النُّعْمَانِ بْنِ سَالِمٍ، عَنِ ابْنِ أَبِي أَوْسٍ، قَالَ كَانَ جَدِّي أَوْسٌ يُصَلِّي فَيُشِيرُ إِلَىَّ وَهُوَ فِي الصَّلاَةِ فَأُعْطِيهِ نَعْلَيْهِ وَيَقُولُ رَأَيْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يُصَلِّي فِي نَعْلَيْهِ ‏.‏

It wasnarrated that Ibn Abu Aws said: “My grandfather, Aws, used toperform prayer, and sometimes he would make a gesture while praying,and I would give him his sandals. He said: ‘I saw the Messenger ofAllah (PBUH) performing prayer in his sandals.’” Translation Not Available

Book Ref: Sunan Ibn Majah Book 5 Hadith 1037
Web Ref:  Sunan Ibn Majah Vol 1 Book 5 Hadith 1037