عَنِ الْبَرَاءِ بْنِ عَازِبٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ لَمْ يَحْنِ رَجُلٌ مِنَّا ظَهْرَهُ حَتَّى يَسْجُدَ ثُمَّ نَسْجُدُ
Sayyiduna Bara bin Azib (may Allah be pleased with him) says: When the Messenger of Allah (peace and blessings be upon him) would raise his head from bowing (ruku‘), none of us would bend his back for prostration (sajdah) until the Prophet (peace and blessings be upon him) had gone into prostration; then we would prostrate.