Bulugh al-Maram #756

Abu Rafi (RAA) narrated that The Messenger of Allah (ﷺ) appointed a man from Bani Makhzum to collect the Zakah. The man said to Abu Rafi', ‘Accompany me so that you may get a share of it.' Abu Rafi, replied, ‘No! Not until I go to the Prophet and ask him’ He went to the Messenger of Allah (ﷺ) and asked him, and the Prophet replied, “The client (slave) of a certain tribe are like (the members of the tribe) themselves and Zakah is not lawful for us.” Related by Ahmad, the three Imams, Ibn Khuzaimah and Ibn Hibban.