Abu Hurayrah (may Allah be pleased with him) reported that he heard the Messenger of Allah (may Allah's peace and blessings be upon him) say: "All of my Ummah may be forgiven except those who commit sin openly. One kind of committing sin openly is when one commits something during the night, then the morning comes and Allah has screened it, but he says: 'O So-and-so, last night, I did such-and-such.' Though he spent the night screened by his Lord (none knowing about his sin), in the morning he removes Allah's screen from himself."