the Messenger of Allah said: "Whoever breaks the fast during Ramadan without an allowance or illness, then if he fasted for all time, his fasting would not make up for it."  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَفْطَرَ يَوْمًا مِنْ رَمَضَانَ مِنْ غَيْرِ رُخْصَةٍ وَلاَ مَرَضٍ لَمْ يَقْضِ عَنْهُ صَوْمُ الدَّهْرِ كُلِّهِ وَإِنْ صَامَهُ