In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Quote: This [Surah ?] is called Ummul Qur’aan because it gathers the meanings of that which is found in the Qur’aan, such as praising Allaah, worship based on commands and prohibitions, promise of reward and punishment in the hereafter, a mention of Allaah’s Attributes and Actions, a mention of the beginning of creation and the Hereafter.

Quote: Some of the Ulamaa named this [Hadeeth ?] Ummus Sunnah [The Essence or Summary of The Sunnah] just as Surah Al-Faatihah is Ummul Qur’aan [The Essence or Summary of The Qur’aan]. That is because all the Sunnah revolves round this hadeeth (in general). In this hadeeth, there’s a clarification regarding the Aqeedah because Aqeedah is the foundation of the six pillars of Eemaan…etc

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Ummul_Qur’aan_Ummus_Sunnah