Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 2-357b
"عَنْ عَبْدِ الرَّحْمَنِ بْنِ أبْزَى أَنَّ عُمَرَ قَنَتَ فِى صَلَاةِ الغَدَاةِ قَبْلَ الرُّكُوع بِالسُّورَتَيْنِ: اللَّهُمَّ إِنَّا نَسْتَعِينُكَ، اللَّهُمَّ إِيَّاكَ نَعْبُدُ".
Notes
الطحاوى
machine translational-Ṭaḥāwī
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No grade is recorded for this wording. Ask what scholars say about its grade