9:5When 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 pay the alms, then let them go their way. God is Most Forgiving, Most Merciful.

9:122It is not advisable for the believers to march out altogether. Of every division that marches out, let a group remain behind, to gain understanding of the religion, and to notify their people when they have returned to them, that they may beware.

9:126Do they not see that they are tested once or twice every year? Yet they do not repent, and they do not learn.