Sunan an-Nasa'i 2146

Arabic

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 ‏"‏ ‏.‏

Translation

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

Authenticity

Sahih · Abu Ghuddah

Reference