Language:
كتاب فضائل القرآن
66  
Virtues of the Qur'an
(34)
Chapter: What is the proper period for reciting the whole Qur'an
(34)
بَابٌ في كَمْ يُقْرَأُ الْقُرْآنُ
Sahih al-Bukhari 5051

Narrated Sufyan:

Ibn Shubruma said, "I wanted to see how much of the Qur'an can be enough (to recite in prayer) and I could not find a Surah containing less than three Verses, therefore I said to myself), "One ought not to recite less than three (Quranic) Verses (in prayer)."

حَدَّثَنَا عَلِيٌّ، حَدَّثَنَا سُفْيَانُ، قَالَ لِي ابْنُ شُبْرُمَةَ نَظَرْتُ كَمْ يَكْفِي الرَّجُلَ مِنَ الْقُرْآنِ فَلَمْ أَجِدْ سُورَةً أَقَلَّ مِنْ ثَلاَثِ آيَاتٍ، فَقُلْتُ لاَ يَنْبَغِي لأَحَدٍ أَنْ يَقْرَأَ أَقَلَّ مِنْ ثَلاَثِ آيَاتٍ‏.‏
Reference : Sahih al-Bukhari 5051
In-book reference : Book 66, Hadith 75
USC-MSA web (English) reference : Vol. 6, Book 61, Hadith 571
  (deprecated numbering scheme)