Language:
كتاب الحج
25  
Hajj (Pilgrimage)
(136)
Chapter: The Rami of the Jimar with seven small stones
(136)
باب رَمْىِ الْجِمَارِ بِسَبْعِ حَصَيَاتٍ
Sahih al-Bukhari 1748

Narrated `Abdur-Rahman bin Yazid:

When `Abdullah, reached the big Jamra (i.e. Jamrat-ul-Aqaba) he kept the Ka`ba on the left side and Mina on his right side and threw seven pebbles (at the Jamra) and said, "The one on whom Surat-al- Baqara was revealed (i.e. the Prophet) had done the Rami similarly."

حَدَّثَنَا حَفْصُ بْنُ عُمَرَ، حَدَّثَنَا شُعْبَةُ، عَنِ الْحَكَمِ، عَنْ إِبْرَاهِيمَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ أَنَّهُ انْتَهَى إِلَى الْجَمْرَةِ الْكُبْرَى جَعَلَ الْبَيْتَ عَنْ يَسَارِهِ، وَمِنًى عَنْ يَمِينِهِ، وَرَمَى بِسَبْعٍ، وَقَالَ هَكَذَا رَمَى الَّذِي أُنْزِلَتْ عَلَيْهِ سُورَةُ الْبَقَرَةِ صلى الله عليه وسلم‏.‏
Reference : Sahih al-Bukhari 1748
In-book reference : Book 25, Hadith 226
USC-MSA web (English) reference : Vol. 2, Book 26, Hadith 804
  (deprecated numbering scheme)