Sayyiduna Anas (may Allah be pleased with him) said: We came with Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him), and he led us in the morning prayer at a place called al-Mirbad. Then we reached the mosque while the prayer was being held, so we prayed again with Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3651