[Machine] During the time of the Prophet Muhammad ﷺ , she said, "Don't you recite this Surah, O Mu'ammil?" I said, "Yes." She said, "Verily, Allah enjoined the performance of the night prayer in the beginning of this Surah. So the Prophet ﷺ and his Companions stood in prayer all night until their feet swelled up. Then Allah held back the end of this Surah (i.e., revelation was stopped for a period of time) for twelve months. Then Allah revealed the leniency at the end of this Surah, so voluntary night prayers after the obligatory prayers are now optional."
عَنْ قِيَامِ رَسُولِ اللهِ ﷺ قَالَتْ «أَلَسْتَ تَقْرَأُ هَذِهِ السُّورَةَ يَا أَيُّهَا الْمُزَّمِّلُ؟» قُلْتُ بَلَى قَالَتْ «فَإِنَّ اللهَ افْتَرَضَ الْقِيَامَ فِي أَوَّلِ هَذِهِ السُّورَةِ فَقَامَ النَّبِيُّ ﷺ وَأَصْحَابُهُ حَوْلًا حَتَّى انْتَفَخَتْ أَقْدَامُهُمْ وَأَمْسَكَ اللهُ خَاتِمَتَهَا اثْنَيْ عَشْرَ شَهْرًا ثُمَّ أَنْزَلَ اللهُ ﷻ التَّخْفِيفَ فِي آخِرِ هَذِهِ السُّورَةِ فَصَارَ قِيَامُ اللَّيْلِ تَطَوُّعًا بَعْدَ فَرِيضَةٍ» مُخْتَصَرٌ