Yā Sīn (also Yaseen; , ; the letters 'Yāʼ' and 'Sīn') is the 36th chapter of the Quran (sūrah). It has 83 verses (āyāt). It is regarded an earlier "Meccan surah". Some scholars maintain that verse 12 is from the Medinan period. While the surah begins in Juz' 22, most of it is in Juz' 23. The surah begins with the eponymous (muqatta'at) Arabic letters: (yā sīn). The meaning of the letters Ya Sin, while being primarily unknown, is debated amongst Muslim religious academics. One of the interpretations is "O human being!" referring to Muhammad since the verses that follow are translated as "By the Qur´an, full of Wisdom, Thou art indeed one of the messengers". Tafsir al-Jalalayn, a Sunni beginners exegesis (tafsir), concludes, "God knows best what He means by these [letters]." The surah focuses on establishing the Qur'an as a divine source, and it warns of the fate of those who 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. The surah ends with arguments in favor of the existence of Resurrection and God's sovereign power. Summary 1-3 God swears that Muhammad is a prophet 4-5 The Quran given to warn the Makkans 6-9 The greater part of the people of Makkah reprobate 10 Muhammad's preaching only profitable to secret believers 11 The dead shall be raised; all their deeds are registered 12-13 Two apostles of Jesus sent to Antioch 14-17 They are rejected as impostors and threatened with stoning 18 The apostles warn the people of Antioch of impending divine judgments 19-26 A certain believer is put to death by the infidels 27-28 The persecutors are suddenly destroyed 29 Men generally reject God's messengers 30 The lessons of the past are forgotten 31-33 The doctrine of the resurrection asserted and illustrated 34-44 God's power and goodness manifested by his works 45-46 Unbelievers unmoved by either fear or the signs of the Quran 47-48 They scoff at almsgiving and the resurrection 49-53 The resurrection trumpet and the judgment-day shall surprise the unbelievers 54 God's judgment shall be according to works 55-65 The rewards of the righteous and the punishment of the wicked 66-68 God deals with the wicked as he pleaseth 69-70 Muhammad not a poet;