Al-Tabarani says: This is Sayyiduna Amir bin Fuhayrah (may Allah be pleased with him), a client (mawla) of Sayyiduna Abu Bakr (may Allah be pleased with him). He was one of the earliest Muhajirun. He emigrated from Makkah to Madinah together with the Prophet (peace and blessings be upon him) and Sayyiduna Abu Bakr (may Allah be pleased with him). He had the honour of taking part in the Battle of Badr, and he was martyred on the day of Bi'r Ma'unah.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 15645