Ya-Sin, 83 Meccan verses, is one of the most beloved surahs, widely called 'the heart of the Quran.' It affirms the prophethood of Muhammad, tells of the messengers rejected by a town and the believer who defended them, and marshals the signs of nature and resurrection, ending with the reviving of dry bones as proof of the raising of the dead (36:78-79).
Ya-Sin's reputation as "the heart of the Quran" rests on a hadith whose chain of transmission later scholars of hadith criticism, including al-Tirmidhi who transmitted it, rated as weak, a fact that has not diminished the surah's devotional standing in practice. Its central parable, of messengers sent to a town that rejects them and a lone believer who runs to defend them and is killed for it, only to be welcomed into paradise while his killers are destroyed by a single blast, is read by commentators as a compressed statement of the whole Quranic pattern of prophecy, rejection and vindication that recurs across many longer surahs. The surah's closing argument for resurrection, that the God who first created bones from nothing can surely restore them once decayed, became a set-piece of Islamic apologetics against those who denied the afterlife, cited by theologians from the classical period onward as a model of reasoning from creation to resurrection rather than an appeal to scripture alone. The believer's speech to his people, urging them to follow the messengers "who ask no reward of you," is itself often extracted from the surah and cited independently in Islamic preaching as a model of disinterested testimony, a single verse that circulates well beyond the passage it comes from.