Sunan an-Nasa'i, Hadith 2144 ⓘ
It was narrated that 'Abdullah said: "Messenger of Allah said: "The Messenger of Allah said: 'Take Shaur, for in Sahur there is blessing."' 'Ubaidullah bin Saeed narrated it in Mawquaf from.
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، قَالَ حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ، عَنْ عَاصِمٍ، عَنْ زِرٍّ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " تَسَحَّرُوا فَإِنَّ فِي السَّحُورِ بَرَكَةً " . وَقَفَهُ عُبَيْدُ اللَّهِ بْنُ سَعِيدٍ .
also referenced under: Book 22, Hadith 55 (In-Book) & Volume 3, Book 22, Hadith 2146 (DarusSalam)