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Takhrij Hadith 711: "I certainly know of people…"
On the authority of Thawban, the Prophet ﷺ said:
“
I certainly know of people from my nation who will come on the Day of Resurrection with good deeds as great as the white mountains of Tihamah, yet Allah, the Mighty and Majestic, will render them as scattered dust". Thawban said: "O Messenger of Allah, describe them to us. Make them known to us so that we do not become one of them without realizing it". The Prophet ﷺ replied: "Indeed, they are your brothers and from your own people. They pray during the night just as you pray. However, when they are alone and beyond the sight of others, they violate the sacred limits of Allah".”