ALTHOUGH most of the commentators regard this surah as a Meccan revelation, Zamakhshari and (among the later scholars) Suyuti ascribe it to the Medina period. Baydawi leaves the question open, and adds that parts of it may have been revealed before and parts after the Prophet's hijrah to Medina. Some authorities are of the opinion that it followed immediately upon surah 13 ("Thunder"): an opinion which is not very helpful since that surah, too, cannot be assigned to either of the two periods with any degree of certainty.