Sayyiduna Zayd bin Arqam (may Allah be pleased with him) narrates: The first to offer prayer with the Prophet (peace and blessings be upon him) was Sayyiduna Abu Bakr (may Allah be pleased with him).
Al-Tabarani recorded it in al-Mu'jam al-Awsat. Its chain contains a narrator, Ghalib bin Abdullah bin Ghalib al-Sa'di, and I do not know him.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 14312