Ibrahim bin Abd al-Aziz bin Abd al-Malik bin Abi Mahdhurah (may Allah have mercy on him) said: I heard my father and my grandfather, both of them narrating from Sayyiduna Abu Mahdhurah (may Allah be pleased with him), that he used to give the adhan for the Prophet (peace and blessings be upon him); he would say the iqamah once each, except 'Qad qamat al-salah', which he said twice.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1963