Ubaydullah bin Abi Rafi' (may Allah have mercy on him) narrates: "When naming those who took part (in battle) alongside Sayyiduna Ali (may Allah be pleased with him): Sayyiduna Husayn bin al-Harith (may Allah be pleased with him), a veteran of Badr, who took part with him in all his battles, from Banu al-Muttalib bin Abd Manaf (he mentioned his name)."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3544