Verse 5of 78

Which was revealed in MakkahImam Ahmad recorded that Zirr said that a man said to Ibn Mas`ud: "How is this recited: "Ma'in Ghayri Yasin or Asin" He asked him, "Are you that proficient in reciting the whole Qur'an" He replied, "I recite the Mufassal section in one Rak`ah." So he said, "Woe to you! Do you recite the Qur'an in haste, as if it is poetry I know that the Prophet used to recite two Surahs from the beginning of the Mufassal section (in one Rak`ah).

Source: Tafsir Ibn Kathir — abridged excerpt