Language:
كتاب الوتر
14  
Witr Prayer
(2)
Chapter: The timing of the Salat-ul-Witr (Witr prayer)
(2)
باب سَاعَاتِ الْوِتْرِ
Sahih al-Bukhari 995

Narrated Anas bin Seereen:

I asked Ibn `Umar, "What is your opinion about the two rak`at before the Fajr (compulsory) prayer, as to prolonging the recitation in them?" He said, "The Prophet (ﷺ) used to pray at night two rak`at followed by two and so on, and end the prayer by one rak`ah witr. He used to offer two rak`at before the Fajr prayer immediately after the Adhan." (Hammad, the sub-narrator said, "That meant (that he prayed) quickly.)"

حَدَّثَنَا أَبُو النُّعْمَانِ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، قَالَ حَدَّثَنَا أَنَسُ بْنُ سِيرِينَ، قَالَ قُلْتُ لاِبْنِ عُمَرَ أَرَأَيْتَ الرَّكْعَتَيْنِ قَبْلَ صَلاَةِ الْغَدَاةِ أُطِيلُ فِيهِمَا الْقِرَاءَةَ فَقَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يُصَلِّي مِنَ اللَّيْلِ مَثْنَى مَثْنَى، وَيُوتِرُ بِرَكْعَةٍ وَيُصَلِّي الرَّكْعَتَيْنِ قَبْلَ صَلاَةِ الْغَدَاةِ وَكَأَنَّ الأَذَانَ بِأُذُنَيْهِ‏.‏ قَالَ حَمَّادٌ أَىْ سُرْعَةً‏.‏
Reference : Sahih al-Bukhari 995
In-book reference : Book 14, Hadith 6
USC-MSA web (English) reference : Vol. 2, Book 16, Hadith 109
  (deprecated numbering scheme)