Hadith 618 - Call to Prayers (Adhaan) - Sahih Al-Bukhari - صحيح البخاري - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

10. Call to Prayers (Adhaan) - كتاب الأذان

12) Chapter: The Adhan after Al-Fajr (dawn)

Narrated Hafsa:

When the Mu'adh-dhin pronounced the Adhan for Fajr prayer and the dawn became evident the Prophet ordered a two rak`at light prayer (Sunna) before the Iqama of the compulsory (congregational) prayer.

Reference: 618
English reference: Vol. 1, Book 11, Hadith 592
In-book reference: Book 10, Hadith 16
Grade: Sahih
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12) باب الأَذَانِ بَعْدَ الْفَجْرِ

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، قَالَ أَخْبَرَتْنِي حَفْصَةُ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ إِذَا اعْتَكَفَ الْمُؤَذِّنُ لِلصُّبْحِ وَبَدَا الصُّبْحُ صَلَّى رَكْعَتَيْنِ خَفِيفَتَيْنِ قَبْلَ أَنْ تُقَامَ الصَّلاَةُ‏.‏