كتاب الصيام
13  
The Book of Fasting
(9)
Chapter: The virtue of sahur, which is recommended. It is recommended to delay it and to hasten the breaking of the fast
(9)
باب فَضْلِ السُّحُورِ وَتَأْكِيدِ اسْتِحْبَابِهِ وَاسْتِحْبَابِ تَأْخِيرِهِ وَتَعْجِيلِ الْفِطْرِ ‏‏
Sahih Muslim 1099 b

Abu 'Atiyya reported:

I and Misruq went to 'A'isha (Allah be pleased with her) and Masruq said to her: There are two persons among the Companions of Muhammad (ﷺ) none of whom abandons the good, but one of them hastens to observe sunset prayer and break the fast, and the other delays in observing the sunset prayer and in breaking the fast, whereupon she said: Who hastens to observe sunset prayer and break the fast? He said: It is 'Abdullah. Upon this she said: This is how the Messenger of Allah (ﷺ) used to do.
وَحَدَّثَنَا أَبُو كُرَيْبٍ، أَخْبَرَنَا ابْنُ أَبِي زَائِدَةَ، عَنِ الأَعْمَشِ، عَنْ عُمَارَةَ، عَنْ أَبِي عَطِيَّةَ، قَالَ دَخَلْتُ أَنَا وَمَسْرُوقٌ، عَلَى عَائِشَةَ - رضى الله عنها - فَقَالَ لَهَا مَسْرُوقٌ رَجُلاَنِ مِنْ أَصْحَابِ مُحَمَّدٍ صلى الله عليه وسلم كِلاَهُمَا لاَ يَأْلُو عَنِ الْخَيْرِ أَحَدُهُمَا يُعَجِّلُ الْمَغْرِبَ وَالإِفْطَارَ وَالآخَرُ يُؤَخِّرُ الْمَغْرِبَ وَالإِفْطَارَ ‏.‏ فَقَالَتْ مَنْ يُعَجِّلُ الْمَغْرِبَ وَالإِفْطَارَ قَالَ عَبْدُ اللَّهِ ‏. فَقَالَتْ هَكَذَا كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَصْنَعُ ‏.‏
Reference : Sahih Muslim 1099b
In-book reference : Book 13, Hadith 63
USC-MSA web (English) reference : Book 6, Hadith 2420
  (deprecated numbering scheme)