Yā Sīn (Arabic: سورة يس‎) is the 36th 'chapter' of the Qur'an with 83 ayat, and is one of the Meccan suras. It is often referred to as "the Heart of the Qur'an" in accordance with a well-known hadith of the Islamic prophet, Muhammad(P.B.U.H.). The sura focuses on establishing the Qur'an as a divine source, and it warns of the fate of those that mock God's revelations and are stubborn. The sura tells of the punishments that plagued past generations of nonbelievers as a warning to present and future generations. Additionally, the sura reiterates God's sovereignty as exemplified by His creations through signs from nature. The sura ends with arguments in favor of the existence of Resurrection and God's sovereign power. The name of the chapter comes from the two letters of the first verse of the chapter, which has caused much scholarly debate, and which Tafsir al-Jalalayn, a Sunni Tafsir, interprets by saying "God knows best what He means by these."

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