It is narrated from Abd al-Rahman bin Abi Layla (may Allah have mercy on him): The Companions of the Prophet (peace and blessings be upon him) (may Allah be pleased with them) told us that Abdullah bin Zayd al-Ansari (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, I saw in a dream a man standing on top of a wall; he gave the adhan in pairs and the iqamah in pairs, then sat down, and he was wearing two green cloaks.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1975
It is narrated from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that the prayer was changed through three stages. He narrated the hadith of the dream of Sayyiduna Abdullah bin Zayd (may Allah be pleased with him) and mentioned the adhan twice each, then at the end of the adhan he said: 'Allahu akbar, Allahu akbar, la ilaha illallah' (Allah is the Greatest, Allah is the Greatest, there is no god but Allah). Then he paused for a little while, then stood and said the like of it, except that he added the words 'Qad qamat al-salah, qad qamat al-salah' (The prayer has been established, the prayer has been established).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1976
It is narrated from Abd al-Rahman bin Abi Layla (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) consulted the people about the adhan. Then he narrated the long hadith, in which it says that he gave the adhan twice each, then sat down, then said the iqamah twice each.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1977
(a) Husayn narrated it to us. (b) A group of hadith scholars narrated it from Abd al-Rahman bin Abi Layla (may Allah have mercy on him). (c) Despite the disagreement in its chain, the hadith is mursal, because Abd al-Rahman bin Abi Layla did not meet Mu'adh or Abdullah bin Zayd, nor did he name who narrated it to him from the two of them or from either of them.
Muhammad bin Ishaq bin Khuzaymah said: Abd al-Rahman bin Abi Layla did not hear from Mu'adh bin Jabal nor from Abdullah bin Zayd bin Abd Rabbih, the one who saw the adhan; so it is not permissible to use a report that is not established as evidence against reports that are established.
Other reports on this subject have been narrated through other routes, all of them weak; I have explained their weakness in al-Khilafiyyat. The best chain narrated for saying the iqamah twice is the hadith of Abd al-Rahman bin Abi Layla, and even if it were authentic, every adhan narrated in pairs came after the dream of Abdullah bin Zayd, so it would take precedence over what is narrated about his dream; and there is also disagreement about how the iqamah was in his dream: the people of Madinah narrate it singly and the people of Kufah twice each. The chain of the Madinans is connected (mawsul) and the chain of the Kufans is mursal; alongside the connected report of the Madinans is the mursal of Sa'id bin al-Musayyib, whose mursal reports are the most authentic among the Successors; then there is the order to say it singly that we have narrated after that, and the practice of the people of the two Harams.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1978