(6) باب فِي الرَّجُلِ يَسْمَعُ السَّجْدَةَ وَهُوَ رَاكِبٌ وَفِي غَيْرِ الصَّلاَةِ
Narrated Ibn 'Umar:
The Messenger of Allah (ﷺ) would recite to us a surah (according to the version of Ibn Numair) outside the prayer (the agreed version goes), then he would prostrate along with him, and none of us could find a place for his forehead. (RU)
Reference (RU): Sunan Abi Dawud 1412 (RU)
In-book reference (RU): Book 7, Hadith 12 (RU)
English translation (RU): Book 7, Hadith 1407 (RU)