Al-Aswad and Alqamah said: We came to Abdullah bin Mas'ud (may Allah be pleased with him) in his house. He said: Have these people prayed behind you? We said: No. He said: Stand up and pray. He did not order us to give the adhan or the iqamah. Then he completed his prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1910