Al-Baqarah 2:251

Fahazamoohum bi-ithni Allahiwaqatala dawoodu jaloota waatahu Allahualmulka walhikmata waAAallamahu mimma yashaowalawla dafAAu Allahi annasa baAAdahumbibaAAdin lafasadati al-ardu walakinna Allahathoo fadlin AAala alAAalameen

So they defeated them by permission of Allāh, and David killed Goliath, and Allāh gave him the kingship and wisdom [i.e., prophethood] and taught him from that which He willed. And if it were not for Allāh checking [some] people by means of others, the earth would have been corrupted, but Allāh is the possessor of bounty for the worlds.

So, they defeated them by the will of Allah, and Dāwūd (David) killed Jālūt, and Allah gave him the kingdom and the wisdom and taught him what He willed. Had Allah not been pushing back some people by means of others, the earth would have been spoiled. But Allah is All-Gracious to all the worlds.