صحيح البخاري Sahih Bukhari كتاب الأذان (صفة الصلوة) The Book of Adhan (Sufa-tus-Salat)
بَابُ حَدِّ إِتْمَامِ الرُّكُوعِ وَالاِعْتِدَالِ فِيهِ وَالاِطْمَأْنِينَةِ:

(121) Chapter. And what is said regarding the limit of the completion of bowing and of keeping the back straight and the calmness with which it is performed.

1 hadith
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).
Hadith Reference Sahih Bukhari / The Book of Adhan (Sufa-tus-Salat) / Hadith: 792
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة