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:2046a –
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السيوطي:٢٠٤٦a –

"إِذا شَهِدَتْ أُمَّةٌ مِنَ الأمَم وهُمْ أرْبَعون رجلًا فصاعدًا أجازَ اللهُ شهادتهم ".  

[طب] الطبرانى في الكبير [طس] الطبرانى في الأوسط [ض] ضياء المقدسي في مختاره عن أبي المليح عن أبيه

See similar narrations below:

Collected by Ṭabarānī
tabarani:502 – Ibrāhīm b. ʿUmar al-Wakīʿī > Ibrāhīm b. al-Ḥajjāj al-Sāmī > Sawādah b. Abū al-Aswad > Ṣāliḥ b. Hilāl > Abū al-Malīḥ b. Usāmah al-Hudhalī from my father > Nabī Allāh ﷺ

[Machine] "On the authority of the Prophet of Allah ﷺ , he said: When a nation from the nations testifies and there are forty as witnesses, Allah accepts their testimony. Or he said: He affirms their testimony."  

الطبراني:٥٠٢ – حَدَّثَنَا إِبْرَاهِيمُ بْنُ عُمَرَ الْوَكِيعِيُّ ثنا إِبْرَاهِيمُ بْنُ الْحَجَّاجِ السَّامِيُّ ثنا سَوَادَةُ بْنُ أَبِي الْأَسْوَدِ ثنا صَالِحُ بْنُ هِلَالٍ عَنْ أَبِي الْمَلِيحِ بْنِ أُسَامَةَ الْهُذَلِيِّ حَدَّثَنِي أَبِي ؓ

عَنْ نَبِيِّ اللهِ ﷺ قَالَ إِذَا شَهِدَتْ أُمَّةٌ مِنَ الْأُمَمِ وَهُمْ أَرْبَعُونَ فَصَاعِدًا أَجَازَ اللهُ شَهَادَتَهُمْ أَوْ قَالَ صَدَّقَ شَهَادَتَهُمْ