Al-Anfal 8:67

Ma kana linabiyyin an yakoonalahu asra hatta yuthkhina fee al-arditureedoona AAarada addunya wallahuyureedu al-akhirata wallahu AAazeezun hakeem

It is not for a prophet to have captives [of war] until he inflicts a massacre [upon Allāh's enemies] in the land. You [i.e., some Muslims] desire the commodities of this world, but Allāh desires [for you] the Hereafter. And Allāh is Exalted in Might and Wise.

It is not befitting a prophet that he has captives with him unless he has subdued the enemy by shedding blood in the land. You intend to have the stuff of this world, while Allah intends the Hereafter (for you). And Allah is All-Mighty, All-Wise.