"And whoever avenges himself after having been wronged" — meaning, after being oppressed — "then those, there is no cause against them," meaning, no proof (or blame).
﴿وَلمن انتصر بعد ظلمه﴾ بعد مَا ظُلِمَ ﴿فَأُولَئِكَ مَا عَلَيْهِم من سَبِيل﴾ أَي: من حجَّة.
