It is narrated from Amr bin Murrah that he said: I heard Abu Wa'il say that a man came to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and said: Last night I recited all the Mufassal surahs in one rak'ah. Ibn Mas'ud (may Allah be pleased with him) said: Did you rattle through it quickly the way poetry is recited? I certainly know the surahs which the Messenger of Allah (peace and blessings be upon him) used to recite (paired) in one rak'ah. Then he mentioned twenty surahs from the beginning of the Mufassal, two surahs in each rak'ah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2460
It is narrated from Abdullah bin Shaqiq that he said: I asked Sayyidah Aishah (may Allah be pleased with her): Did the Messenger of Allah (peace and blessings be upon him) combine surahs? She said: Yes! He would combine (surahs) from the Mufassal.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2461
It is narrated from Abu Hurayrah (may Allah be pleased with him) that Umar bin al-Khattab (may Allah be pleased with him) recited Surah al-Najm for them and prostrated in it, then he stood up and recited another surah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2463
It is narrated from al-Walid bin Kathir that he said: Nafi' told me that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would recite two or three of the Mufassal surahs in a single rak'ah of the obligatory prayers.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2464