بُلُوغُ الْمَرَامِ
Bulugh al-Maram 347
The Book of Prayer
وَعَنْ اِبْنِ عُمَرَ -رَضِيَ اَللَّهُ عَنْهُمَا- ] قَالَ [ : { كَانَ اَلنَّبِيُّ - صلى الله عليه وسلم -يَقْرَأُ عَلَيْنَا اَلْقُرْآنَ , فَإِذَا مَرَّ بِالسَّجْدَةِ , كَبَّرَ , وَسَجَدَ , وَسَجَدْنَا مَعَهُ } رَوَاهُ أَبُو دَاوُدَ بِسَنَدٍ فِيهِ لِيِنٌ . [1]
Narrated Ibn 'Umar (RA): The Prophet (ﷺ) used to recite the Qur'an to us, and when he came to a place where a prostration should be made, he uttered the Takbir and prostrated and we prostrated with him. [Reported by Abu Dawud through a chain containing some weakness].
Sunnah.com reference: Book 2, Hadith 248