It is narrated from Ibn Abi Mulaykah, or from some other person of the people of Makkah, that "the Prophet (peace and blessings be upon him) ordered Sayyiduna Bilal (may Allah be pleased with him) to climb on top of the roof of the Ka'bah and give the adhan."
In the chain of this narration there is doubt and ambiguity about the name of the narrator; however, Sayyiduna Bilal's (may Allah be pleased with him) giving the adhan on the roof of the Ka'bah by order of the Messenger of Allah (peace and blessings be upon him) on the historic occasion of the Conquest of Makkah is established by other reliable and sahih hadith.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الصلاة / 229
Hadith Gradingمحدثین:إسناده ضعيف، مرسل
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف مرسل. » «أورده ابن حجر فى "المطالب العالية"، 229، 4305، وأخرجه ابن أبى شيبة فى «مصنفه» برقم: 38080»