[Machine] "Do you not read this Surah, O Muzammil?" I replied, "Yes." She said, "Verily, Allah prescribed the standing during the night in the beginning of this Surah." So the Prophet ﷺ and his companions stood until their feet became swollen. Then, Allah removed the obligation after twelve months, and revealed leniency in the end of this Surah. So, the standing during the night became voluntary after the obligatory prayer."  

أَلَيْسَ تَقْرَأُ هَذِهِ السُّورَةَ يَا أَيُّهَا الْمُزَّمِّلُ؟ قُلْتُ بَلَى قَالَتْ فَإِنَّ «اللهَ افْتَرَضَ قِيَامَ اللَّيْلِ فِي أَوَّلِ هَذِهِ السُّورَةِ فَقَامَ نَبِيُّ اللهِ ﷺ وَأَصْحَابُهُ حَوْلًا حَتَّى انْتَفَخَتْ أَقْدَامُهُمْ فَأَمْسَكَ اللهُ خَاتِمَتَهَا اثْنَيْ عَشَرَ شَهْرًا ثُمَّ أَنْزَلَ اللهُ التَّخْفِيفَ فِي آخِرِ هَذِهِ السُّورَةِ فَصَارَ قِيَامُ اللَّيْلِ تَطَوُّعًا بَعْدَ فَرِيضَةٍ»