Mishkat al-Masabih
Mishkat al-Masabih 1199
وَعَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ قَالَ: لَقَدْ عَرَفْتُ النَّظَائِرَ الَّتِي كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقْرِنُ بَيْنَهُنَّ فَذَكَرَ عِشْرِينَ سُورَةً مِنْ أَوَّلِ الْمُفَصَّلِ عَلَى تَأْلِيفِ ابْنِ مَسْعُودٍ سُورَتَيْنِ فِي رَكْعَةٍ آخِرُهُنَّ (حم الدُّخان) و (عَم يتساءلون)
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Abdullah ibn Masud said: I know the paired surahs that the Prophet, peace and blessings be upon him, used to recite together. He mentioned twenty surahs from the beginning of al-Mufassal, according to the arrangement of Ibn Masud, reciting two in each rakah. The last pair were Ha-Mim al-Dukhan and Amma yatasaalun.