This Surah takes its name, An Nur, from verse 35.
Period of Revelation
The consensus of opinion is that it was sent down after the Campaign against Bani al-Mustaliq and this is confirmed by vv. 11-20 that deal with the incident of the "Slander", which occurred during that Campaign. But there is a difference of opinion as to whether this Campaign took place in 5 A. H. before the Battle of the Trench or in 6 A. H. after it. It is important to decide this issue in order to determine whether this Surah was sent down earlier or Surah Al- Ahzab(XXXIII), which is the only other Surah containing the Commandments about the observance of purdah by women. Surah Al-Ahzab was admittedly sent down on the occasion of the Battle of the Trench. Now if this Battle occurred earlier, it would mean that the initial instructions in connection with the Commandments of purdah were sent down in Surah Al-Ahzab and they were complemented later by the Commandments revealed in this Surah. On the other hand,