Abdullah bin Muhammad al-Ansari narrates from his uncle, Sayyiduna Abdullah bin Zayd (may Allah be pleased with him), that he saw the adhan in a dream; then he came to the Prophet (peace and blessings be upon him) and told him (peace and blessings be upon him) about it. He said: Bilal (may Allah be pleased with him) gave the adhan, and my uncle came to the Prophet (peace and blessings be upon him) and said: O Messenger of Allah, I saw the dream, and Bilal (may Allah be pleased with him) is giving the adhan? He (peace and blessings be upon him) said: "Then you give the iqamah." So my uncle gave the iqamah.
Al-Bukhari said: There is doubt (nazar) about it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1872