Virtues of al-Hasan bin Ali (may Allah be pleased with him): the matter of the adhan

It is narrated from Sufyan bin al-Layl al-Hamdani that he said: I came to Sayyiduna Hasan bin Ali (may Allah be pleased with them both) after he had given the pledge of allegiance to Mu'awiyah, and I said: O you who have blackened the faces of the believers! Then he mentioned (the narration) like the previous hadith.

It is narrated from Sufyan bin al-Layl that when the matter (of the peace settlement) that was to happen between Sayyiduna Hasan bin Ali (may Allah be pleased with them both) and Mu'awiyah (may Allah be pleased with him) had taken place, I came to him in Madinah while he was sitting among his companions (then the narrator mentioned the long hadith). He said: We discussed the adhan in his presence, and some of us said that the adhan began with the dream of Abdullah bin Zayd bin Asim. Sayyiduna Hasan bin Ali (may Allah be pleased with them both) said to him: "The matter of the adhan is far greater than that. Jibril (peace be upon him) gave the adhan in the heaven with each phrase twice and taught it to the Messenger of Allah (peace and blessings be upon him), and he gave the iqamah with each phrase once and taught that too to the Messenger of Allah (peace and blessings be upon him)." So when Sayyiduna Hasan (may Allah be pleased with him) became ruler, he gave the adhan (accordingly).