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:20522a
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السيوطي:٢٠٥٢٢a

"مَنْ أَسْلَمَ عَلَى يَدَيهِ رَجُل فَهُو مَوْلاهُ يَرثُهُ، وَيدِى عَنْهُ".  

[ض] ضياء المقدسي في مختاره عن راشد بن سعد مرسلًا

See similar narrations below:

Collected by Ṭabarānī, Suyūṭī
tabarani:7781[Chain 1] Muḥammad b. al-Faḍl al-Saqaṭī > Saʿīd b. Sulaymān [Chain 2] Muʿādh b. al-Muthanná > Musaddad > ʿĪsá b. Yūnus > Muʿāwiyah b. Yaḥyá > al-Qāsim > Abū Umāmah

[Machine] The Messenger of Allah ﷺ said, "Whoever accepts Islam under the hand of a person, then that person becomes his guardian."  

الطبراني:٧٧٨١حَدَّثَنَا مُحَمَّدُ بْنُ الْفَضْلِ السَّقَطِيُّ ثنا سَعِيدُ بْنُ سُلَيْمَانَ ح وَحَدَّثَنَا مُعَاذُ بْنُ الْمُثَنَّى ثنا مُسَدَّدٌ قَالَا ثنا عِيسَى بْنُ يُونُسَ عَنْ مُعَاوِيَةَ بْنِ يَحْيَى عَنِ الْقَاسِمِ عَنْ أَبِي أُمَامَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «مَنْ أَسْلَمَ عَلَى يَدَيْ رَجُلٍ فَهُوَ مَوْلَاهُ»