The Messenger of Allah (ﷺ) said: Anyone amongst you who sat in a place of worship waiting for the prayer is in prayer and his ablution is not broken, the angels invoke blessing upon him (in these words): O Allah! pardon him. O Allah! have mercy upon him.
Reference: Sahih Muslim 649 k In-book : Book 5, Hadith 347 USC-MSA web (English) : Book 4, Hadith 1399 (deprecated)
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