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.
suyuti:32-3bʿAbdullāh b. ʿUthmān b. al-Arqam
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السيوطي:٣٢-٣b

"عَنْ عَبْدِ الله بْنِ عُثْمَانَ بْنِ الأَرْقَم، عَنْ جَدِّه وَكَانَ بَدْرِيًّا وَكَانَ رَسُولُ الله ﷺ فِى دَارِه الَّتى عِنْدَ الصَّفَا حَتَّى تَكَامَلُوا أَرْبَعينَ رَجُلًا مُسْلِمِينَ وَكَانَ آخِرَهُمْ إِسْلَامًا عُمَرُ فَلَمَّا تَكَامَلُوَا أَرْبَعِينَ رَجُلًا خَرَجُوا إِلَى المُشْرِكينَ".  

[طب] الطبرانى في الكبير وأبو منده، [ك] الحاكم في المستدرك وأبو نعيم