It was narrated from Thawban that the Prophet ﷺ said:
“I certainly know people of my nation who will come on the Day of Resurrection with good deeds like the mountains of Tihamah, but Allah will make them like scattered dust.” Thawban said: “O Messenger of Allah, describe them to us and tell us more, so that we will not become of them unknowingly.” He said: “They are your brothers and from your race, worshipping at night as you do, but they will be people who, when they are alone, transgress the sacred limits of Allah.”

حَدَّثَنَا عِيسَى بْنُ يُونُسَ الرَّمْلِيُّ، حَدَّثَنَا عُقْبَةُ بْنُ عَلْقَمَةَ بْنِ حُدَيْجٍ الْمَعَافِرِيُّ، عَنْ أَرْطَاةَ بْنِ الْمُنْذِرِ، عَنْ أَبِي عَامِرٍ الأَلْهَانِيِّ، عَنْ ثَوْبَانَ، عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ : " لأَعْلَمَنَّ أَقْوَامًا مِنْ أُمَّتِي يَأْتُونَ يَوْمَ الْقِيَامَةِ بِحَسَنَاتٍ أَمْثَالِ جِبَالِ تِهَامَةَ بِيضًا فَيَجْعَلُهَا اللَّهُ عَزَّ وَجَلَّ هَبَاءً مَنْثُورًا " . قَالَ ثَوْبَانُ : يَا رَسُولَ اللَّهِ صِفْهُمْ لَنَا جَلِّهِمْ لَنَا أَنْ لاَ نَكُونَ مِنْهُمْ وَنَحْنُ لاَ نَعْلَمُ . قَالَ : " أَمَا إِنَّهُمْ إِخْوَانُكُمْ وَمِنْ جِلْدَتِكُمْ وَيَأْخُذُونَ مِنَ اللَّيْلِ كَمَا تَأْخُذُونَ وَلَكِنَّهُمْ أَقْوَامٌ إِذَا خَلَوْا بِمَحَارِمِ اللَّهِ انْتَهَكُوهَا " .