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.
قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَفْطَرَ يَوْمًا مِنْ رَمَضَانَ مِنْ غَيْرِ رُخْصَةٍ رَخَّصَهَا اللَّهُ لَهُ لَمْ يَقْضِ عَنْهُ صِيَامُ الدَّهْرِ