The Prophet ﷺ said: If anyone breaks his fast one day in Ramadan without a concession granted to him by Allah, a perpetual fast will not atone for it. (Using translation from Abū Dāʾūd 2396)
عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أَفْطَرَ يَوْمًا مِنْ رَمَضَانَ مِنْ غَيْرِ رُخْصَةٍ رَخَّصَهَا اللهُ لَهُ لَمْ يَقْضِ عَنْهُ صِيَامُ الدَّهْرِ وَإِنْ صَامَهُ