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:4-974b – ʿAl
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السيوطي:٤-٩٧٤b –

"عَنْ عَلىٍّ قَالَ: أَسْلَم زَيْدُ بْنُ حَارِثَةَ مَوْلى رَسُولِ الله ﷺ فَكَانَ أَوَّلَ ذَكَرٍ أسْلَمَ وَصَلَّى".  

[كر] ابن عساكر في تاريخه

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:4652 – Aḥmad b. ʿAbdullāh b. ʿAbd al-Raḥīm al-Barqī > ʿAbd al-Malik b. Hishām > Ziyād b. ʿAbdullāh > Muḥammad b. Isḥāq > Aslam

[Machine] Zaid bin Harithah accepted Islam after Ali, and he was the first to accept Islam after him.  

الطبراني:٤٦٥٢ – حَدَّثَنَا أَحْمَدُ بْنُ عَبْدِ اللهِ بْنِ عَبْدِ الرَّحِيمِ الْبَرْقِيُّ ثنا عَبْدُ الْمَلِكِ بْنُ هِشَامٍ ثنا زِيَادُ بْنُ عَبْدِ اللهِ عَنْ مُحَمَّدِ بْنِ إِسْحَاقَ قَالَ

«أَسْلَمَ زَيْدُ بْنُ حَارِثَةَ بَعْدَ عَلِيٍّ ؓ فَكَانَ أَوَّلَ مَنْ أَسْلَمَ بَعْدَهُ»  

tabarani:4653 – Abū Shuʿayb al-Ḥarrānī > Saʿīd b. Abū Maryam > Ibn Lahīʿah > Ibn Shihāb

[Machine] The first person to convert to Islam was Zaid ibn Haritha.  

الطبراني:٤٦٥٣ – حَدَّثَنَا أَبُو شُعَيْبٍ الْحَرَّانِيُّ ثنا سَعِيدُ بْنُ أَبِي مَرْيَمَ ثنا ابْنُ لَهِيعَةَ عَنِ ابْنِ شِهَابٍ قَالَ

«أَوَّلُ مَنْ أَسْلَمَ زَيْدُ بْنُ حَارِثَةَ»