Hadith 4.2
Fasting
Abu Huraira reported God’s messenger as saying, “If anyone breaks his fast one day in Ramadan without a concession* or without being ill, a perpetual fast will not atone for it even if he observes it.” *e.g. while travelling. Ahmad, Tirmidhi, Abu Dawud, Ibn Majah, Darimi and Bukhari in a chapter heading transmitted it. Tirmidhi said that he heard Muhammad, i.e. Bukhari, say this was the only tradition he knew by Abul Mutawwis the transmitter.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَفْطَرَ يَوْمًا مِنْ رَمَضَانَ مِنْ غَيْرِ رُخْصَةٍ وَلَا مَرَضٍ لَمْ يَقْضِ عَنْهُ صَوْمُ الدَّهْرِ كُلِّهِ وَإِنْ صَامَهُ» . رَوَاهُ أَحْمَدُ وَالتِّرْمِذِيُّ وَأَبُو دَاوُدَ وَابْنُ مَاجَهْ وَالدَّارِمِيُّ وَالْبُخَارِيُّ فِي تَرْجَمَةِ بَابٍ وَقَالَ التِّرْمِذِيُّ: سَمِعْتُ مُحَمَّدًا يَعْنِي البُخَارِيّ يَقُول. أَبُو المطوس الرَّاوِي لَا أَعْرِفُ لَهُ غَيْرَ هَذَا الْحَدِيثِ
Hadith gradings, numbering and translations can differ between editions. For legal rulings or detailed interpretation, consult qualified scholarship and the referenced edition.