Translation:

39. To those against whom war is made permission is given (to fight) because they are wronged and verily Allah is Most powerful for their aid

Notes (Tafseer)

2816. Several translators have failed to notice that yuqataluna (in the best-approved texts) is in the passive voice, "against whom war is made",-not "who take arms against the unbelievers" as Sale translates it. The clause "and verily...their aid" is parenthetical. Verse 40 connects on with "they are wronged". The wrong is indicated: 'driven by persecution from their home, for no other reason than that they worshipped the One True God'. This was the first occasion on which fighting-in self-defence-was permitted. This passage therefore undoubtedly dates from Madinah.