Ṭā Hā (; ) is the 20th chapter (sūrah) of the Qur'an with 135 verses (āyāt). It is named "Ṭā Hā" because the chapter starts with the Arabic ḥurūf muqaṭṭaʿāt (disjoined letters): (Ṭāhā) which is considered to be one of the names of the Islamic prophet Muhammad. Regarding the timing and contextual background of the revelation (asbāb al-nuzūl), it is traditionally believed to be a Meccan surah, from the second Meccan period (615-619), which means it is believed to have been revealed in Mecca, rather than later in Medina. Among the subjects treated in this chapter are God's call of Moses (), the Exodus of the Israelites and the crossing of the Red Sea (), the worship of the Golden Calf () and the Fall of Man (). The main theme of the chapter is about the existence of God. It addresses this theme through stories about Moses and Adam. Sura 20 displays several thematic and stylistic patterns described by Angelika Neuwirth in Jane McAuliffe's book "The Cambridge Companion to the Qur'an". These include the eschatological prophecies of the Quran, signs of God's existence, and debate. Additionally, sura 20 employs what has been termed the "ring structure" to reinforce its central theme. This is the chapter that convinced Umar to convert to Islam. The oldest surviving manuscript containing chapter Ṭā Hā is a Quranic manuscript in the Mingana Collection identified as having been written on the Birmingham Quran manuscript, dated 0-25 AH. Summary 1-3 The Quran an admonition from God to the faithful 4-7 God one, a Sovereign King, omniscient, and possessed of most excellent names The History of Moses 8-10 He sees the burning bush 11-12 God speaks to him out of the fire 13-14 He is chosen and instructed by God 15-17 A day of judgment will surely come 18-24 God bestows on him signs and miracles 25 He is commanded to go to Pharaoh 26-35 Moses prays for the assistance of Aaron 36-42 God reminds Moses of former favours 43-50 He is sent with Aaron to Pharaoh 51-57 Conversation between Pharaoh and Moses 58-59 Pharaoh rejects Moses and accuses him of imposture 60-62 Pharaoh proposes to meet Moses and Aaron with countermiracles 63-64 Moses warns the magicians against deception 65 The magicians dispute among themselves 66 They counsel Pharaoh against Moses 67 Pharaoh encourages the magicians to do their best 68-72 The contest between Moses and the