“Whoever does not fast one day in Ramadan without having a concession allowing that, fasting for a lifetime will not make up for that.” (Using translation from Ibn Mājah 1672)
قَالَ رَسُولُ اللهِ ﷺ مَنْ أَفْطَرَ يَوْمًا مِنْ رَمَضَانَ مِنْ غَيْرِ رُخْصَةٍ لَمْ يَجْزِهِ صِيَامُ الدَّهْرِ