Translation:

50. If thou couldst see when the angels take the souls of the unbelievers (at death) (how) they smite their faces and their backs (saying): "Taste the penalty of the blazing fire.

Notes (Tafseer)

1219. In contrast to the taunt against those who trust in Allah, "that their religion has misled them," is shown the terrible punishment, after death, of those who laughed at Faith.