Hadith 1760

It was narrated from Hafsah that: When the call for Subh prayer was given, the Messenger of Allah (SAW) would pray two brief rak'ahs before going to the prayer.

أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنْ حَفْصَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّهُ كَانَ إِذَا نُودِيَ لِصَلاَةِ الصُّبْحِ رَكَعَ رَكْعَتَيْنِ خَفِيفَتَيْنِ قَبْلَ أَنْ يَقُومَ إِلَى الصَّلاَةِ ‏.‏

Reference: 1117680
In-book reference: Book 20, Hadith 1760
Hadith 1760 - The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day - Sunan an-Nasa'i - Sunnah.com