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.
tabarani:12470ʿUmar b. Ḥafṣ al-Sadūsī > Isḥāq b. Bishr al-Kāhilī > Khalaf b. Khalīfah > Abū Hāshim al-Rummānī > Saʿīd b. Jubayr > Ibn ʿAbbās

[Machine] "Thirty-nine men and women embraced Islam with the Prophet, and Umar embraced Islam when he was forty years old. Then Allah revealed, 'O Prophet, Allah is sufficient for you and for whoever follows you among the believers.'"  

الطبراني:١٢٤٧٠حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ السَّدُوسِيُّ ثنا إِسْحَاقُ بْنُ بِشْرٍ الْكَاهِلِيُّ ثنا خَلَفُ بْنُ خَلِيفَةَ عَنْ أَبِي هَاشِمٍ الرُّمَّانِيِّ عَنْ سَعِيدِ بْنِ جُبَيْرٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

أَسْلَمَ مَعَ النَّبِيِّ ﷺ تِسْعَةٌ وَثَلَاثُونَ رَجُلًا وَامْرَأَةٌ وَأَسْلَمَ عُمَرُ تَمَامَ الْأَرْبَعِينَ فَأَنْزَلَ اللهُ ﷻ {يَا أَيُّهَا النَّبِيُّ حَسْبُكَ اللهُ وَمَنِ اتَّبَعَكَ مِنَ الْمُؤْمِنِينَ}