Forty Hadiths On Ramadan
Hadith No. 34
Eating of sahari
The Holy Prophet (peace be upon him and his progeny) has said: Eat your 'sahari' (the morning meal before the start of a fast) even if it is (mere) mouthfuls of water, for the blessings of Allah are upon those who eat the sahur.Tahdheeb al-Akhaam, vol. 4, pg. 198