faces [their] turn back -
On the Day when some faces will be (lit up with) white, and some faces will be (in the gloom of) black: To those whose faces will be black, (will be said): "Did ye reject Faith after accepting it? Taste then the penalty for rejecting Faith."
在那日,有些脸将变成白皙的,有些脸将变成黧黑的。至于脸色变黑的人(天神将对他们说):”你们既信道之后又不信道吗?你们为不信道而尝试刑罚吧。”