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)
Sahih al-Bukhari 503

Narrated Anas:

I saw the most famous people amongst the companions of the Prophet (ﷺ) hurrying towards the pillars at the Maghrib prayer before the Prophet (ﷺ) came for the prayer.

حَدَّثَنَا قَبِيصَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرِو بْنِ عَامِرٍ، عَنْ أَنَسٍ، قَالَ لَقَدْ رَأَيْتُ كِبَارَ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم يَبْتَدِرُونَ السَّوَارِيَ عِنْدَ الْمَغْرِبِ‏.‏ وَزَادَ شُعْبَةُ عَنْ عَمْرٍو عَنْ أَنَسٍ حَتَّى يَخْرُجَ النَّبِيُّ صلى الله عليه وسلم‏.‏
Reference : Sahih al-Bukhari 503
In-book reference : Book 8, Hadith 150
USC-MSA web (English) reference : Vol. 1, Book 9, Hadith 482
  (deprecated numbering scheme)