Verse 1of 85

The Virtues of the Surahs that begin with Ha MimIbn `Abbas, may Allah be pleased with him, said, "Everything has an essence and the essence of the Qur'an is the family of Ha Mim," or he said, "the Ha Mims." Mis`ar bin Kidam said, "They used to be called `the brides'." All of this was recorded by the the Imam, great scholar, Abu `Ubayd Al-Qasim bin Sallam, may Allah have mercy upon him, in his book Fada'il Al-Qur'an.

Source: Tafsir Ibn Kathir — abridged excerpt