Quran

 9:5

فَإِذَا انْسَلَخَ الْأَشْهُرُ الْحُرُمُ فَاقْتُلُوا الْمُشْرِكِينَ حَيْثُ وَجَدْتُمُوهُمْ وَخُذُوهُمْ وَاحْصُرُوهُمْ وَاقْعُدُوا لَهُمْ كُلَّ مَرْصَدٍ ۚ فَإِنْ تَابُوا وَأَقَامُوا الصَّلَاةَ وَآتَوُا الزَّكَاةَ فَخَلُّوا سَبِيلَهُمْ ۚ إِنَّ اللَّهَ غَفُورٌ رَحِيمٌ ﴿٥﴾

5. Then, when the Sacred Months have passed, kill the polytheists wherever you find them. And capture them, and besiege them, and lie in wait for them at every ambush. But if they repent, and perform the prayers, and give the alms, then let them go their way. Allah is Most Forgiving, Most Merciful.