Al-Anfal 8:22

Inna sharra addawabbi AAindaAllahi assummu albukmu allatheena layaAAqiloon

Indeed, the worst of living creatures in the sight of Allāh are the deaf and dumb who do not use reason [i.e., the disbelievers].

Surely, the worst of all animals in the sight of Allah are the deaf and the dumb who do not understand.