Food, drink and desire between dawn and sunset. But the Prophet ﷺ named a breaker that empties the fast while the stomach stays completely empty.
Qays ibn Sirmah al-Ansari (RA) worked his land all day in the heat, fasting. When sunset came he went home and asked his wife whether there was anything to eat. There was nothing. She went out to find some, and while she was gone, sleep took him. She came back and found him lying there, and she knew exactly what that meant. In those first years, a fasting man who slept before he broke his fast lost the whole night. He carried the fast straight through into the next day. By midday he fainted in the field. The Prophet ﷺ was told what had happened, and the verse came down that moved the line (Sahih al-Bukhari 1915).
Start there, because it settles the question before it is even asked. The boundary of the fast is not drawn by how much a human being can endure. It is drawn by Allah, and He drew it in a single verse. It has been made permissible for you the night preceding fasting to go to your wives (2:187). The same verse goes on: and eat and drink until the white thread of dawn becomes distinct to you from the black thread of night, then complete the fast until the night. It closes by calling these the limits set by Allah, not to be approached. Food, drink, and marital relations, in the hours between first light and sunset. That is what the verse names. Almost everything else in the passage around it is mercy.
The white thread and the black thread is a beautiful phrase and it confused people immediately. Adi ibn Hatim (RA) took it literally. He found a white string and a black string, put them under his pillow, and lay there through the night looking at them, waiting for one to separate from the other. Nothing happened. In the morning he told the Prophet ﷺ the whole story, and the Prophet ﷺ explained that the two threads were the blackness of the night and the whiteness of the dawn (Sahih al-Bukhari 1916). Not string. Sky.
The other end of the day is even simpler. When night comes in from this side and the day goes out from that side and the sun has set, said the Prophet ﷺ, the fasting person breaks his fast (Sahih al-Bukhari 1954). No waiting for full darkness, no adding a safety margin of your own invention.
And the beginning was guarded just as carefully. Bilal (RA) used to give the call to prayer while it was still night, and the Prophet ﷺ told the people not to stop eating for it. Keep eating and drinking, he said, until Ibn Umm Maktum (RA) calls, because he does not call until dawn has actually come (Sahih al-Bukhari 1919). Two men, two calls, and a clear instruction not to end the meal early out of nervousness.
Food and drink are obvious. The third is not spoken about much, so the Quran spoke about it plainly, and so did the man who came to the Prophet ﷺ and said, I have been ruined. Asked what had happened, he said he had gone to his wife while he was fasting. He was asked whether he could free a slave, and he could not. Whether he could fast two consecutive months, and he could not. Whether he could feed sixty poor people, and he could not.
Then the scene turns. A large basket of dates arrived, and the Prophet ﷺ asked where the man was. Take this, he said, and give it away in charity. The man looked at it and said that by Allah, there was no household between the two mountains of Medina poorer than his own. The Prophet ﷺ smiled until his back teeth showed, and told him to feed his family with it (Sahih al-Bukhari 1936). The man came in saying he was destroyed and walked out carrying food for his children. Sit with that for a second. The line is real, the seriousness is real, and so is what met him when he crossed it.
Here is the mercy nobody expects. A person forgets, eats half a sandwich, drinks a glass of water, then freezes in horror. The Prophet ﷺ said that whoever eats or drinks forgetfully should complete his fast, because what he ate and drank was given to him by Allah (Sahih al-Bukhari 1933). Read that again. Not tolerated, not overlooked. Given. The food is described as a provision Allah handed him, and the day continues untouched.
The fast, in other words, is not a trap laid for the absent minded. It is answerable to intention. What a person chooses to put past his lips is his. What slips past while his mind is elsewhere is not held against him at all.
The Quran wrote the exemptions into the command itself, in the same breath, not as an afterthought years later. Whoever among you is ill or on a journey, then an equal number of other days (2:184). The same clause repeats in the next passage, and then Allah states the reason outright. Allah intends for you ease and does not intend for you hardship (2:185).
The Prophet ﷺ enforced that. Travelling once, he saw a crowd gathered around a man, shading him from the sun. He asked what was going on. They told him the man was fasting. It is not righteousness, he said, that you fast while travelling (Sahih al-Bukhari 1946). The man was not being praised for pushing through. He was being corrected. The days are made up later, and the ledger closes even.
Because someone always wants to go further, the Prophet ﷺ closed that door too. Do not practise continuous fasting, he told them, meaning fasting straight through the night without breaking. They objected that he did it himself. I am not like any of you, he answered, I am given food and drink by my Lord (Sahih al-Bukhari 1961).
That is the whole logic of the verse ending on limits. Ibn Kathir, commenting on the close of 2:187, reads them as everything Allah had just explained about the fast, what is permitted in it and what is prohibited, fenced so people would neither cross the line nor crowd it. A limit protects from both sides. It stops you falling short, and it stops you inventing a harder religion than the one you were given.
Now the part that changes how a person actually spends the day. The Prophet ﷺ said that whoever does not give up false speech and acting on it, Allah has no need of his leaving his food and drink (Sahih al-Bukhari 1903).
Whoever does not give up false speech. Not who eats. Not who drinks. A man can go the full sixteen hours with nothing in his stomach and still be told that Allah has no use for what he did. Lying, backbiting, tearing at someone's name while your own tongue is dry from thirst. He said elsewhere that fasting is a shield, so the fasting person should not behave stupidly or trade insults, and if anyone picks a fight with him he should say, I am fasting (Sahih al-Bukhari 1894).
So there are two ways to lose a day of Ramadan. One is to eat, and everybody knows about that one. The other is to keep the mouth empty of food and fill it with the destruction of another human being.
Food, drink, and marital relations, between the whitening of the dawn and the setting of the sun. Forgetting does not. Illness and travel do not, they move the day to another date. And the harder question, the one about injections, inhalers, blood tests and everything else the first generation never had in front of them, is exactly where this article stops. Later scholars discuss those cases at length and they do not all land in the same place. If that is your question, take it to someone qualified to answer it, not to a page on the internet.
But the question worth carrying into the month is not the technical one. It is the one Abu Hurayrah (RA) transmitted. Your stomach is empty. What has your tongue been doing all day?
Silsila Research Desk
Grade: Sahih · 7 min read