His father reported that the Prophet ﷺ was on a military expedition when a man from the polytheists challenged a Muslim to single combat and killed him. Then another Muslim came forward against him and the polytheist killed him as well. Then the polytheist drew near and stood before the Prophet ﷺ and asked, "For what cause are you fighting?"The Prophet ﷺ replied, "Our religion requires us to fight people until they bear witness that there is no god but Allah and that Muhammad is His servant and Messenger, and that Allah is exalted by His right."The man said, "By Allah, this is truly excellent. I believe in this." Then he crossed over to the Muslims and charged at the polytheists, fighting until he was killed. His body was carried and laid beside the two Muslims he had killed.The Messenger of Allah ﷺ said, "These are among the most deeply loving companions in Paradise."
عن أبيه، أن النبي ﷺ كان غزاة، فبارز رجل من المشركين رجلا من المسلمين فقتله المشرك، ثم برز له آخر من المسلمين فقتله المشرك، ثم دنا فوقف على النبي ﷺ، فقال: على ما تقاتلون؟ فقال: ديننا: أن نقاتل الناس حتى يشهدوا أن لا إله إلا الله، وأن محمدا عبده ورسوله، وإن نفى الله بحقه قال: والله إن هذا لحسن، آمنت بهذا، ثم تحول إلى المسلمين، فحمل على المشركين فقاتل حتى قتل فحمل، فوضع مع صاحبيه اللذين قتلهما، فقال رسول الله ﷺ: هؤلاء أشد أهل الجنة تحابا.
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Tabarani narrated it in Awsat (2652, Majma Bahrayn), and from him Abu Naeem in Hilya (2/317), from Muhammad bin Husayn bin Mukarram, who said, Ahmad bin Ibrahim Dawraqi told us, Itaab bin Ziyad told us, Abdullah bin Mubarak told us, Abdul-Rahman bin Ubaydullah informed me, from Abu Imran Juni, from Abu Bakr bin Abu Musa, and he mentioned it.Haythami said in Majma (5/296), "Tabarani narrated it in Kabir and Awsat, and Ibn Mubarak's hearing from Masudi is sahih, so the hadith is sahih, Allah willing, for its narrators are trustworthy."I say, Masudi's name is Abdul-Rahman bin Abdullah, while Ibn Mubarak's teacher in this hadith is Abdul-Rahman bin Ubaydullah, as it appears in Majma Bahrayn and Hilya. If it is indeed in the diminutive form, then it has not become clear to me who this is. However, he has been corroborated.Ibn Shahin narrated it in Targhib (452) via Abdul-Hameed bin Abdul-Rahman bin Farwa Ajli, from Abu Imran Juni, with similar wording.Abdul-Hameed Ajli was not deemed trustworthy by anyone except Ibn Hibban, who mentioned him in Thiqat (7/118), and he is acceptable for use in corroborating narrations.