What are the prohibitions for the fasting person, and what are the consequences of intercourse during the day?

Question : There are things that are forbidden or disliked for the fasting person. Perhaps you are discussing these things?

Answer : The prohibitions for the fasting person are of two types: prohibitions specifically for the sake of fasting, which are the things that break the fast, and general prohibitions such as lying, backbiting, talebearing, cheating, listening to forbidden songs, and the like. As for the things that break the fast, if the fasting person consumes them, they sever it, meaning his fast becomes invalid.
The greatest of these is intercourse. If a man has intercourse with his wife while he is in a state where fasting is obligatory, five things are connected to his intercourse. First, he has committed a sin, as it is the most serious sin in Ramadan, even if he had an excuse. Second, he must abstain for the rest of the day, because this day is a day of respect that must be preserved. Third, he must make up the fast. Fourth, he must pay the expiation, which is a severe expiation: freeing a slave. If he cannot find one, he must fast for two consecutive months. If he cannot do that, he must feed sixty poor people. Fifth, his fast is invalid. These are the five things that follow for one who has intercourse during the day of Ramadan while fasting is obligatory upon him: the sin, the invalidity of the fast, the obligation to abstain for the rest of the day, the obligation to make up the fast, and the expiation.
However, if he has intercourse while fasting during the day of Ramadan but he is traveling, then he owes nothing except making up the fast only. That means four of the five things do not apply to him; only making up the fast is required of him. So if a person is traveling and has fasted in Ramadan, and then he wants to come to his wife on that day, he may do so. But his fast is broken; he does not have to make up the fast [Note: The Arabic text here appears to contain a transcription error or contradiction, as it states "his fast is broken... he does not have to make up the fast" but later clarifies the ruling for travelers. Based on the standard ruling and the context of "only making up the fast is required" in the previous sentence, the intended meaning is that the fast is invalid and must be made up, but no expiation is required. The phrase "لا يجب عليه القراءة" likely is a mishearing of "لا يجب عليه الكفارة" (he does not have to pay the expiation) or similar. However, translating strictly: "But his fast is broken; he does not have to make up the fast. It is invalid because he had intercourse, and he must [perform the prayer? - likely a transcription error for 'make up the fast' or 'fast']... In this case, meaning if he has intercourse while traveling, he may eat and drink for the rest of the day and there is no blame on him; rather, he may complete it all."
If a person does this while awake, ignorant, or forced and not intending it, there is no sin on him and no making up the fast. If a person eats or drinks thinking that the sun has set, and it turns out that it has not set, his fast is valid. But from the moment it becomes clear to him that it has not set, he must abstain. The evidence for this is the generality of the saying of Allah the Exalted: So Allah the Exalted said: I have done it.
And from the Sunnah is what al-Bukhari narrated from Asma bint Abi Bakr (may Allah be pleased with them both) that the people broke their fast in the time of the Prophet (peace and blessings be upon him) on a cloudy day, and then the sun appeared. It was not reported that they were ordered to make up the fast. If making up the fast had been obligatory upon them, the Prophet (peace and blessings be upon him) would have ordered them to do so, and if he had ordered them, it would have been transmitted to us. Likewise, if a person was fasting and forgot, and he ate or drank, he should complete his fast.
And there is no making up the fast for him, because of the saying of Allah the Exalted: This is general. And because of the saying of the Prophet (peace and blessings be upon him): "Whoever forgets..." But as soon as he remembers, he must abstain, even if the mouthful is in his mouth, he must spit it out.