THERE is hardly any doubt that this surah as a whole was revealed in the late part of the Mecca period, immediately preceding surah 17 (Al-Isra); but according to some authorities, verse 85 was revealed at a place called Juhfah during the Prophet's flight from Mecca to Medina. The conventional "title" appears to have been taken at random from the word al-qasas occurring in the second part of verse 25 - a choice that may have been influenced by the fact that about one-half of the surah is devoted to the story of Moses. It is noteworthy that most of this story depicts the purely human aspects of his life - that is to say, the impulses, perplexities and errors which are part of the human condition as such: aspects which the Qur'an stresses in order to counteract any possible tendency on the part of the pious to attribute "superhuman" or, in the last resort, semi-divine qualities to God's apostles. Appropriately; the surah ends with a sonorous evocation of the truth that "there is no deity save God", and that "everything is bound to perish, save His [eternal] Self".
Ta. Sin. Mim.1