“The pre-dawn meal (suḥūr) is all blessing, so do not abandon it — even if one of you were to take only a single sip of water. For indeed Allah — Mighty and Majestic — and His angels send blessings upon those who partake in suḥūr.”

Narrated by Aḥmad (11086) from the ḥadīth of Abū Saʿīd al-Khudrī — may Allah be pleased with him.
Authenticated in Silsilat al-Aḥādīth al-Ṣaḥīḥah (1654) and Ṣaḥīḥ al-Targhīb wa al-Tarhīb (1070).

Brief Explanation of the Hadith

Fasting is among the greatest acts of worship to which Islam has given profound attention, and so it has legislated matters that assist the servant in completing it in the best and most perfect manner. Among these is the encouragement to partake in suḥūr, for it is an emphatically recommended Sunnah that the Prophet — may Allah’s peace and blessings be upon him — practiced himself and urged his Ummah to observe.
Suḥūr is the food eaten at the time of saḥar by the one intending to fast, and it is a source of blessing due to the manifold good it contains. It assists one in worship, strengthens the body for fasting, and grants vigor throughout the day. It also entails following the Sunnah, differing from the People of the Book, and seizing the time of saḥar — a time distinguished by remembrance, supplication, and seeking forgiveness. Thus, it is fitting that suḥūr be a manifest blessing in both religion and worldly life.
His statement, “So do not abandon it, even if one of you were to take only a single sip of water,” means: do not leave suḥūr under any circumstance, even if the amount is small, for its blessing is attained merely by performing it with a righteous intention.
As for his words, “Indeed Allah and His angels send blessings upon those who partake in suḥūr,” the meaning is that Allah bestows praise and mercy upon them, and the angels supplicate for their forgiveness and blessing — a recompense for their diligence in observing this noble Sunnah.
In this ḥadīth there is an indication that suḥūr is a Sunnah not to be abandoned — even if it be only a sip of water — in order to uphold the practice of the Prophet — may Allah’s peace and blessings be upon him — and to differ from the People of the Book.
The ḥadīth also affirms the prayers and blessings of Allah — Exalted is He — and His angels upon those who partake in suḥūr.