Sura

Sura

A sura is a division of the Qur'an, often referred to as a chapter. The term chapter is sometimes avoided, as the suras are of unequal length; the shortest sura has only three ayat while the longest contains 286 ayat...

 Ta-Ha is the 20th sura of the Qur'an

Qur'an

The Quran , also transliterated Qur'an, Koran, Alcoran, Qur’ān, Coran, Kuran, and al-Qur’ān, is the central religious text of Islam, which Muslims consider the verbatim word of God . It is regarded widely as the finest piece of literature in the Arabic language...

 with 135 ayat. It is a Makkan sura.
It is named "Ta-Ha" because the sura starts with the Arab letters طه (see Muqatta'at

Muqatta'at

Muqatta'at are unique letter combinations that begin certain suras of the Qur'an. Muqatta'at literally means abbreviated or shortened. Their meanings remain unclear and are considered by most Muslims to be divine secrets....

).

Among the subjects treated in this sura are God's call of Moses , the Exodus

The Exodus

The Exodus is the story of the departure of the Israelites from ancient Egypt described in the Hebrew Bible.Narrowly defined, the term refers only to the departure from Egypt described in the Book of Exodus; more widely, it takes in the subsequent law-givings and wanderings in the wilderness...

 of the Israelites and the crossing of the Red Sea , the worship of the Golden Calf

Golden calf

According to the Hebrew Bible, the golden calf was an idol made by Aaron to satisfy the Israelites during Moses' absence, when he went up to Mount Sinai...

  and the Fall of Man . This is the Sura that let Umar

Umar

`Umar ibn al-Khattāb c. 2 November , was a leading companion and adviser to the Islamic prophet Muhammad who later became the second Muslim Caliph after Muhammad's death....

 be converted to Islam.