Al-Baqarah 2:194

Ashshahru alharamu bishshahrialharami walhurumatu qisasunfamani iAAtada AAalaykum faAAtadoo AAalayhibimithli ma iAAtada AAalaykum wattaqoo AllahawaAAlamoo anna Allaha maAAa almuttaqeen

[Battle in] the sacred month is for [aggression committed in] the sacred month, and for [all] violations is legal retribution. So whoever has assaulted you, then assault him in the same way that he has assaulted you. And fear Allāh and know that Allāh is with those who fear Him.

The holy month for the holy month, and the sanctities are subject to retribution. So when anyone commits aggression against you, be aggressive against him in the like manner as he did against you, and fear Allah, and be sure that Allah is with the God-fearing.