Sayyiduna Abu Mahdhurah (may Allah be pleased with him) states: The Prophet (peace and blessings be upon him) assigned (in Makkah) the adhan to us and to our clients (mawali), the provision of water (siqayah) to Banu Hashim, and cupping (hijamah) to Banu Abd al-Dar.
Imam Ahmad recorded this narration. Its chain contains a narrator whose name has not been stated.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 1899