Sunan An-Nasa'i
Hadith #1005
It was narrated that 'Amr bin Murrah said:""I heard Abu Wa'il say: ""A man said in the presence of Abdullah: 'I recited Al-Mufassal in one rak'ah.' He said: 'That is like reciting poetry. I know the similar surahs that the Messenger of Allah (ﷺ) used to recite together.' And he mentioned twenty surahs from Al-Mufassal, two by two in each rak'ah