Al-Anfal · 8:7

7. Allah reminds the believers who were arguing about when Allah promised them success over one of the groups of the idolaters: either the caravan with its sizeable wealth, so that they could take its bounty, or a group of fighters whom they would encounter and achieve victory over them; but they had wanted it to be the caravan, as this would be easy to take without having to fight. Yet Allah willed for the truth to be established through commanding them to fight, to kill the leaders of the idolaters, and to capture many of them so that the strength of Islam would become clear.