The following is from a work-in-progress called The Qur'an: a Book Report, in which I read each surah of the Qur'an and write about what I learn.
This is a Meccan surah which makes an oath, by the towering (star) constellations, that those who persecute believers will be punished on the Day of Resurrection. Interestingly, however, the main examples it gives to prove this point are not persecuted Muslims, but (some scholars believe) Christians and Jews: 1.) Yemeni Christians who were persecuted by a 6th century Jewish ruler, and 2.) the ancient Jewish patriarch Abraham who was persecuted by a guy named Nimrod. The point here seems to be that ANY religious persecution is bad—no matter who is doing the persecuting, or being persecuted. This is a surprisingly inclusive message.