Nuhaiq bin Sinan Salmi says: I came to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and said: I recited the Mufassal surahs in one rak'ah at night. He said: You must have recited quickly like reading poetry or scattering inferior dates. The Qur'an has been detailed so that you may also recite its words slowly and deliberately. Indeed, I know those twenty similar surahs which the Prophet (peace and blessings be upon him) used to combine and recite. According to the compilation of Sayyiduna Ibn Mas'ud (may Allah be pleased with him), it is mentioned to recite Surah Rahman and Surah Najm in one rak'ah, then Surah Dukhan and Surah {عَمَّ یَتَسَاءَ لُونَ} in one rak'ah.