صحيح البخاري
Bukhari
كتاب الأذان (صفة الصلوة)The Book of Adhan (Sufa-tus-Salat)
بَابُ اسْتِوَاءِ الظَّهْرِ فِي الرُّكُوعِ:
Chapter. To keep the back straight in bowing.
Hadith 792
حَدَّثَنَا بَدَلُ بْنُ الْمُحَبَّرِ ، قَالَ : حَدَّثَنَا شُعْبَةُ ، قَالَ : أَخْبَرَنِي الْحَكَمُ ، عَنْ ابْنِ أَبِي لَيْلَى ، عَنْ الْبَرَاءِ ، قَالَ : " كَانَ رُكُوعُ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَسُجُودُهُ وَبَيْنَ السَّجْدَتَيْنِ ، وَإِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ مَا خَلَا الْقِيَامَ وَالْقُعُودَ قَرِيبًا مِنَ السَّوَاءِ " .
Narrated Al-Bara: The bowing, the prostration the sitting in between the two prostrations and the standing after the bowing of the Prophet but not qiyam (standing in the prayer) and qu`ud (sitting in the prayer) used to be approximately equal (in duration).
وَقَالَ أَبُو حُمَيْدٍ فِي أَصْحَابِهِ : رَكَعَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، ثُمَّ هَصَرَ ظَهْرَهُ .
Abu Humayd (may Allah be pleased with him) said to his companions that the Prophet (peace and blessings of Allah be upon him) performed rukū‘, then bent his back completely.
