Sunan an Nasai
2151
Sahih+2

It was narrated that Abu Hurairah said :"The Messenger of Allah said: 'Eat Sahur, for in Sahur there is blessing." (Hasan) Abu 'Abdur-Rahman (An-Nasai) said: In this narration of Yahya bin Saeed, its chain is Hasan but it is Munkar, and I fear that the error is from Muhammad bin Fudail

SahihAbu Ghuddah
SahihAl-Albani