(14) باب اسْتِحْبَابِ رَكْعَتَيْ سُنَّةِ الْفَجْرِ وَالْحَثِّ عَلَيْهِمَا وَتَخْفِيفِهِمَا وَالْمُحَافَظَةِ عَلَيْهِمَا وَبَيَانِ مَا يُسْتَحَبُّ أَنْ يُقْرَأَ فِيهِمَا
'A'isha reported:
The Messenger of Allah (ﷺ) used to observe two rak'ahs of Sunnah (prayer) when he heard the Adhin and shortened them. (ID)
Reference (ID): Sahih Muslim 724 a (ID)
In-book reference (ID): Book 6, Hadith 111 (ID)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1567 (ID)