Language:
كتاب التهجد
19  
Prayer at Night (Tahajjud)
(7)
Chapter: Sleeping in the last hours of the night
(7)
باب مَنْ نَامَ عِنْدَ السَّحَرِ
Sahih al-Bukhari 1132b

Narrated Al-Ashath:

He (the Prophet (p.b.u.h) ) used to get up for the prayer on hearing the crowing of a cock.

حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ قَالَ أَخْبَرَنَا أَبُو الأَحْوَصِ عَنِ الأَشْعَثِ قَالَ إِذَا سَمِعَ الصَّارِخَ قَامَ فَصَلَّى‏.
Reference : Sahih al-Bukhari 1132b
In-book reference : Book 19, Hadith 13
USC-MSA web (English) reference : Vol. 2, Book 21, Hadith 233
  (deprecated numbering scheme)