Language:
كتاب الصلاة
8  
Prayers (Salat)
(95)
Chapter: To offer As-Salat (the prayer) facing a pillar
(95)
باب الصَّلاَةِ إِلَى الأُسْطُوَانَةِ
Sahih al-Bukhari 502

Narrated Yazid bin Al `Ubaid:

I used to accompany Salama bin Al-Akwa` and he used to pray behind the pillar which was near the place where the Qur'ans were kept. I said, "O Abu Muslim! I see you always seeking to pray behind this pillar." He replied, "I saw Allah's Messenger (ﷺ) always seeking to pray near that pillar."

حَدَّثَنَا الْمَكِّيُّ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا يَزِيدُ بْنُ أَبِي عُبَيْدٍ، قَالَ كُنْتُ آتِي مَعَ سَلَمَةَ بْنِ الأَكْوَعِ فَيُصَلِّي عِنْدَ الأُسْطُوَانَةِ الَّتِي عِنْدَ الْمُصْحَفِ‏.‏ فَقُلْتُ يَا أَبَا مُسْلِمٍ أَرَاكَ تَتَحَرَّى الصَّلاَةَ عِنْدَ هَذِهِ الأُسْطُوَانَةِ‏.‏ قَالَ فَإِنِّي رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم يَتَحَرَّى الصَّلاَةَ عِنْدَهَا‏.‏
Reference : Sahih al-Bukhari 502
In-book reference : Book 8, Hadith 149
USC-MSA web (English) reference : Vol. 1, Book 9, Hadith 481
  (deprecated numbering scheme)