“Whoever does not fast one day in Ramadan without having a concession allowing that, fasting for a lifetime will not make up for that.”
قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَفْطَرَ يَوْمًا مِنْ رَمَضَانَ مِنْ غَيْرِ رُخْصَةٍ لَمْ يُجْزِهِ صِيَامُ الدَّهْرِ