Al-Hajj 22:60

Thalika waman AAaqaba bimithlima AAooqiba bihi thumma bughiya AAalayhi layansurannahuAllahu inna Allaha laAAafuwwun ghafoor

That [is so]. And whoever responds [to injustice] with the equivalent of that with which he was harmed and then is tyrannized - Allāh will surely aid him. Indeed, Allāh is Pardoning and Forgiving.

Having said this, whoever afflicts (someone) with a punishment equal to what he was afflicted with (by the latter), and still he (the former) is (again) subjected to aggression (by the latter), Allah will certainly help him. Indeed, Allah is Most-Pardoning, Most-Forgiving.