Sahih Muslim Book 004, Hadith Number 1792.

Chapter : "The Qur'an has been revealed in seven modes of "reading" and its meaning.

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."

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