FROM various allusions (particularly in verses 11-20) to historical incidents connected with the Prophet's campaign against the tribe of Mustaliq, it is evident that this surah was revealed towards the end of the fifth or the beginning of the sixth year after the hijrah. A large part of it deals with the mutual relations of the sexes and with certain ethical rules to be observed in the context of this relationship. Verses 2-9, in particular, lay down definite legal injunctions concerning illicit sexual intercourse, while verses 27-29 and 58-59 stress each individual's right to privacy. The title is derived from the mystic parable of the "light of God" in verse 35 and its echo in verse 40: "he to whom God gives no light, no light whatever has he!"
A SURAH [is this] which We have bestowed from on high, and which We have laid down in plain terms;1 and in it have We bestowed from on high messages which are clear [in themselves], so that you might keep [them] in mind.