Do only the faces of disbelievers become dark, or do the faces of those who commit sins also become dark?

Question:
He says: Honorable Shaykh, may Allah grant you success, are those whose faces become dark the disbelievers, or do those who commit sins also fall under this?

Answer:
The disbelievers are those whose faces become dark with pure darkness, may Allah protect us from that, and the darkness does not go away. As for the people of sins, their faces may become dark to some extent, and then they become white afterward. Yes.