Aya number 217 of surat Al-Baqara
بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ
يَسْأَلُونَكَ عَنِ الشَّهْرِ الْحَرَامِ قِتَالٍ فِيهِ قُلْ قِتَالٌ فِيهِ كَبِيرٌ وَصَدٌّ عَنْ سَبِيلِ اللَّهِ وَكُفْرٌ بِهِ وَالْمَسْجِدِ الْحَرَامِ وَإِخْرَاجُ أَهْلِهِ مِنْهُ أَكْبَرُ عِنْدَ اللَّهِ وَالْفِتْنَةُ أَكْبَرُ مِنَ الْقَتْلِ وَلَا يَزَالُونَ يُقَاتِلُونَكُمْ حَتَّىٰ يَرُدُّوكُمْ عَنْ دِينِكُمْ إِنِ اسْتَطَاعُوا وَمَنْ يَرْتَدِدْ مِنْكُمْ عَنْ دِينِهِ فَيَمُتْ وَهُوَ كَافِرٌ فَأُولَٰئِكَ حَبِطَتْ أَعْمَالُهُمْ فِي الدُّنْيَا وَالْآخِرَةِ وَأُولَٰئِكَ أَصْحَابُ النَّارِ هُمْ فِيهَا خَالِدُونَ [٢١٧]
Translation: English - Sahih International
They ask you about the sacred month - about fighting therein. Say, "Fighting therein is great [sin], but averting [people] from the way of Allah and disbelief in Him and [preventing access to] al-Masjid al-Haram and the expulsion of its people therefrom are greater [evil] in the sight of Allah . 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.
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