<P> The surah 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 surah tells of the punishments that plagued past generations of nonbelievers as a warning to present and future generations . Additionally, the surah reiterates God's sovereignty as exemplified by His creations through signs from nature . </P> <P> The surah ends with arguments in favor of the existence of Resurrection and God's sovereign power . </P> <P> It has been proposed that Yāʾ - Sīn is the "heart of the Quran". The meaning of "the heart" has been the basis of much scholarly discussion . The eloquence of this surah is traditionally regarded as representative of the miraculous nature of the Qur'an . It presents the essential themes of the Qur'an, such as the sovereignty of God, the unlimited power of God as exemplified by His creations, Paradise, the ultimate punishment of nonbelievers, resurrection, the struggle of believers against polytheists and nonbelievers, and the reassurance that the believers are on the right path, among others . Yā Sīn presents the message of the Qur'an in an efficient and powerful manner, with its quick and rhythmic verses . This surah asserts that Muhammad was not a poet, rather he was the greatest and the last messenger of Allah to come . </P> <P> It is recorded in Sunan al - Darimi that Muhammad said that "If anyone recites Yaseen at the beginning of the day, their needs for that day will be fulfilled ." In another narration, this Surat has been described as the key to all good in this life and in the hereafter and a safety from all evil in this life and in the hereafter . Needs are fulfilled if asked after the recitation of this Surat and the reward for its recitation is also compared to performing twenty hajj pilgrimages . </P>

Which surah is known as the heart of the quran