Sahih Muslim, 1909

Abu Wa'il reported:A person came to 'Abdullah, who was called Nahik b. Sinan, and the rest of the hadith is the same but for this:" Alqama came to him ('Abdullah b. Mas'ud) and we said to him: Ask him about the manners in which he combined (two surahs) in one rak'ah. So he went to him and asked him and then came to us and said: Twenty are the mufassal surahs in the compilation (of the Qur'an) made by 'Abdullah

Rapporté par Abu Wa'il : Un homme appelé Nahik b. Sinan vint voir Abdullah, et le reste du hadith est identique, sauf pour ce passage : « Alqama vint voir Abdullah b. Mas'ud et nous lui avons dit : Demande-lui comment il associait deux sourates dans une rak'a. Il alla donc le voir, lui posa la question, puis revint vers nous et dit : Dans la compilation du Coran faite par Abdullah, il y a vingt sourates mufassal. »