Sunan an-Nasa'i, Book 22, Hadith 57 (In-Book) ⓘ
It was narrated that Anas said: "The Messenger of Allah said: 'Take Sahur, for in Sahur there is blessing." 'Ata said: "someone who heard him told me that Ibn 'Umar (said) that the Prophet said: 'Whoever fasts every day of his life, then he has not fasted."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا أَبُو عَوَانَةَ، عَنْ قَتَادَةَ، وَعَبْدِ الْعَزِيزِ، عَنْ أَنَسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " تَسَحَّرُوا فَإِنَّ فِي السَّحُورِ بَرَكَةً " .
also referenced under: Hadith 2146 (Reference) & Volume 3, Book 22, Hadith 2148 (DarusSalam)