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Al-Adab al-Mufrad 631
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ: حَدَّثَنَا سُلَيْمَانُ بْنُ الْمُغِيرَةِ، عَنْ ثَابِتٍ قَالَ: كَانَ أَنَسٌ إِذَا دَعَا لأَخِيهِ يَقُولُ: جَعَلَ اللَّهُ عَلَيْهِ صَلاَةَ قَوْمٍ أَبْرَارٍ لَيْسُوا بِظَلَمَةٍ وَلاَ فُجَّارٍ، يَقُومُونَ اللَّيْلَ، وَيَصُومُونَ النَّهَارَ.
When Anas made supplication for his brother, he said, "May Allah bless him with the blessing of those who are pious. They are neither unjust nor corrupt. They stand at night in prayer and fast in the day."
Cited in Al-Adab al-Mufrad (No. 631).