Al-Baqarah 2:217

Yas-aloonaka AAani ashshahri alharamiqitalin feehi qul qitalun feehi kabeerun wasaddunAAan sabeeli Allahi wakufrun bihi walmasjidi alharamiwa-ikhraju ahlihi minhu akbaru AAinda Allahi walfitnatuakbaru mina alqatli wala yazaloona yuqatiloonakumhatta yaruddookum AAan deenikum ini istataAAoowaman yartadid minkum AAan deenihi fayamut wahuwa kafirunfaola-ika habitat aAAmaluhum fee addunyawal-akhirati waola-ika as-habuannari hum feeha khalidoon

They ask you about the sacred month - about fighting therein. Say, "Fighting therein is great [sin], but averting [people] from the way of Allāh and disbelief in Him and [preventing access to] al-Masjid al-Ḥarām and the expulsion of its people therefrom are greater [evil] in the sight of Allāh. And fitnah is greater than killing." And they will continue to fight you until they turn you back from your religion if they are able. And whoever of you reverts from his religion [to disbelief] and dies while he is a disbeliever - for those, their deeds have become worthless in this world and the Hereafter, and those are the companions of the Fire; they will abide therein eternally.

They ask you about the Sacred Month, that is, about fighting in it. Say, “Fighting in it is something grave, but it is much more grave, in the sight of Allah, to prevent (people) from the path of Allah, to disbelieve in Him, and in Al-Masjid-ul-Harām, and to expel its people from there, and Fitnah (to create disorder) is more grave than killing.” They will go on fighting you until they turn you away from your faith if they could, while whoever of you turns away from his faith and dies an infidel, such people are those whose deeds will go to waste in this world and in the Hereafter, and they are people of the Fire. They shall be there forever