Al-Baqarah · 2:191

191. And kill them where you come across them, and make them leave the place they made you leave - which is Makkah. And oppression that stops those who believe from worshipping, making them return to disbelief and ungratefulness is worse than killing. And do not fight with them in the Sacred Mosque, out of respect for it, unless they start fighting you there. If they start fighting in the Sacred Mosque, then kill them. And fighting them if they attack in the Sacred mosque is the reward of those who deny the truth.