(4) Prayer
كتاب الصلاة
(22a) Chapter: Prostration while Reciting the Qur’an - Section 1
(21) باب سجود القرآن - الفصل الأول
Mishkat al-Masabih 1025 
Ibn ‘Umar said:
God’s Messenger was reciting as-Sajda (Al-Qur’an; 32) when we were with him. He was prostrating himself and we were doing so along with him, but we were so crowded that none of us could find a place for his forehead when prostrating himself. (Bukhari and Muslim.)
وَعَنِ ابْنِ عُمَرَ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقْرَأُ (السَّجْدَةَ) وَنَحْنُ عِنْدَهُ فَيَسْجُدُ وَنَسْجُدُ مَعَهُ فَنَزْدَحِمُ حَتَّى مَا يَجِدُ أَحَدُنَا لِجَبْهَتِهِ مَوْضِعًا يَسْجُدُ عَلَيْهِ
 مُتَّفَقٌ عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 1025
In-book reference : Book 4, Hadith 444