“I indeed know that some people from my Ummah will come on the Day of Judgment with good deeds like the white mountains of Tihama, but Allah will make them scattered dust.” Thawban said, ‘O Messenger of Allah, describe them to us, so that we may not be one of them without knowing it!’ He صلى الله عليه وسلم said, “They will be your brothers, and from your people, and they will take from the night as you do (meaning prayers, etc.), but they are a people who, when they were alone with the prohibitions of Allah, violated them.”

Thawbaan رضي الله عنه narrated that the Prophet صلى الله عليه وسلم said:

لأعلمن أقوامًا من أمتي يأتون يوم القيامة بحسنات أمثال جبال ﺗﻬامة بيضًا، فيجعلها الله هباءً »
منثورًا، فقلت: يا رسول الله صفهم لنا، حّلهم لنا ألا نكون منهم ونحن لا نعلم، قال: أما إﻧﻬم
من إخوانكم، من جلدتكم، ويأخذون من الليل كما تأخذون، ولكنهم أقوام إذا خلوا بمحارم
.« الله انتهكوها

“I indeed know that some people from my Ummah will come on the Day of Judgment with good deeds like the white mountains of Tihama, but Allah will make them scattered dust.” Thawban said, ‘O Messenger of Allah, describe them to us, so that we may not be one of them without knowing it!’ He صلى الله عليه وسلم said, “They will be your brothers, and from your people, and they will take from the night as you do (meaning prayers, etc.), but they are a people who, when they were alone with the prohibitions of Allah, violated them.”

(Ibn Maajah) al-Kanaani, the author of Misbaah az-Zujaajah, said this hadith is sound and its narrators are trustworthy.