إِنَّ شَرَّ الدَّوَابِّ عِندَ اللّهِ الَّذِينَ كَفَرُواْ فَهُمْ لاَ يُؤْمِنُونَ
[8:55]
Surely the vilest of animals in Allah's sight are those who disbelieve, then they would not believe.
For the worst of beasts in the sight of Allah are those who reject Him: They will not believe.
Lo! the worst of beasts in Allah's sight are the ungrateful who will not believe.