Some of the mistakes that fasting people make in regard to Suhoor are:
1-Some people do not have Suhoor and this is contrary to the Sunnah. It is from the guidance of the Prophet, sallallaahu ‘alaihi wa sallam, to have Suhoor if the person intends to observe obligatory or voluntary fasting. Urging Muslims to have Suhoor., he, sallallaahu ‘alaihi wa sallam, said:
 “Have Suhoor, as indeed there is a blessing in it.” [Al-Bukhari and Muslim]
“The difference between our fasting and the fasting of the People of the Book is the (meal of) Suhoor.” [Muslim]
Moreover, Suhoor helps the Muslim to fast, and it is a blessed act of the Sunnah, so it should not be overlooked.
2- Having Suhoor early in the middle of the night or one or two hours before dawn is also contrary to the Sunnah. The Prophet, sallallaahu ‘alaihi wa sallam, said: “Hasten to (eating) Iftaar (in Ramadan immediately when the time is due), and delay (eating) Suhoor.” [At-Tabaraani] It is an act of the Sunnah to have Suhoor just before dawn (about half an hour before it). Anas, may Allah be pleased with him, he said: “The Prophet, sallallaahu ‘alaihi wa sallam, and Zayd ibn Thaabit, may Allah be pleased with him, had Suhoor. When they finished, the Prophet, sallallaahu ‘alaihi wa sallam, left for the prayer. Anas, may Allah be pleased with him, was asked how much time was there between their finishing Suhoor and entering the prayer; he said: ‘Enough time for the recitation of 50 verses (of the Qur’an).’” [Al-Bukhari]
3- Continuing to eat (Suhoor) even after hearing the Fajr prayer Athaan. Out of prudence for one’s fasting, one should stop having his Suhoor two or three minutes before or at most when he hears the Athaan for Fajr.


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