Sunan an-Nasa'i, Hadith 1759 ⓘ
It was narrated from Aishah that : The Prophet said: "The two rak'ahs (before) Fajr are better than this world and everything in it."
أَخْبَرَنَا هَارُونُ بْنُ إِسْحَاقَ، قَالَ حَدَّثَنَا عَبْدَةُ، عَنْ سَعِيدٍ، عَنْ قَتَادَةَ، عَنْ زُرَارَةَ بْنِ أَوْفَى، عَنْ سَعْدِ بْنِ هِشَامٍ، عَنْ عَائِشَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " رَكْعَتَا الْفَجْرِ خَيْرٌ مِنَ الدُّنْيَا وَمَا فِيهَا " .
also referenced under: Book 20, Hadith 162 (In-Book) & Volume 2, Book 20, Hadith 1760 (DarusSalam)