Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:2-357b – ʿAbd al-Raḥman b. Bzá
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السيوطي:٢-٣٥٧b –

"عَنْ عَبْدِ الرَّحْمَنِ بْنِ أبْزَى أَنَّ عُمَرَ قَنَتَ فِى صَلَاةِ الغَدَاةِ قَبْلَ الرُّكُوع بِالسُّورَتَيْنِ: اللَّهُمَّ إِنَّا نَسْتَعِينُكَ، اللَّهُمَّ إِيَّاكَ نَعْبُدُ".  

الطحاوى

See similar narrations below:

Collected by Suyūṭī
suyuti:2-252b – Ibn ʿBās
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السيوطي:٢-٢٥٢b –

"عن ابن عباسٍ أَنَّ عمرَ بنَ الخطابِ كانَ يقنُتُ بالسُّورَتَيْنِ: اللهمَّ إنَّا نَستعينُكَ، واللَّهُمَّ إِيَّاكَ نَعبدُ".  

[عب] عبد الرازق ومحمد بن نصر في كتاب الصلاة، والطحاوى