Translation for 51:40

فَأَخَذۡنَٰهُ وَجُنُودَهُۥ فَنَبَذۡنَٰهُمۡ فِي ٱلۡيَمِّ وَهُوَ مُلِيمٞ ٤٠
So We seized him and his soldiers, casting them into the sea while he was blameworthy.1 

Foot notes

222619
Because of his arrogance and disbelief.