The Book of Mosques and Places of Prayer
Ṣaḥīḥ Muslim 1508
اللَّهُمَّ اغْفِرْ لَهُ اللَّهُمَّ ارْحَمْهُ مَا لَمْ يُحْدِثْ وَأَحَدُكُمْ فِي صَلاَةٍ مَا كَانَتِ الصَّلاَةُ تَحْبِسُهُ
Allāhumma āghfir lah Allāhumma ārḥamhu mā lam yuḥdith wa-aḥadukum fī ṣalātin mā kānati aṣ-ṣalāhu taḥbisuhu
Transliteration generated from the Arabic vowel marks
The full narration
Abu Huraira reported Allah's Messenger (ﷺ) as saying:The angels invoke blessings on everyone among you so long as he is in a place of worship with these words: O Allah! pardon him, O Allah, have mercy upon him, (and they continue to do so) as long as, he ablution (of the worshipper) is not broken, and one among you is in prayer and so long as he is detained for the prayer
Source
Ṣaḥīḥ Muslim · 1508
Ṣaḥīḥ
- Agreed upon as authentic (al-Bukhārī / Muslim)