Arak bin Malik عراك بن مالك الغفاري · The Book of Zakah

"Ibn 'Alqamah appointed my father to be in charge of his people, and he commanded him to collect their Sadaqah. My father sent me to a group of them to bring their Sadaqah to him. I set out and came to an old man who was called Sa'r. I said: My father has sent me to collect the Sadaqah of your sheep. 'He said: O son of my brother, how will you decode what you want to take?' I said"…

Ibn 'Alqamah appointed his father to collect the Zakah of his people - and he quoted the same Hadith.

"Umar said: 'The Messenger of Allah enjoined Sadaqah and it was said that Ibn Jamil, Khalid bin Al-Walid and 'Abbas bin 'Abdul-Muttalib had withheld some. The Messenger of Allah said: What is the matter with Ibn Jamil? Was he not poor then Allah made him rich? As for Khalid bin Al-Walid, you are being unfair to Khalid, for he is saving his shields and weapons for the sake of Allah. As for Al-Abbas bin 'Abdul-Muttalib, the paternal uncle of the…

"A man came to the Prophet and said: 'I feared that I might be killed after you are gone for the sake of a goat or sheep of the Sadaqah.' He said: 'Were it not that it will be given to the poor Muhajirin I would not have taken it."' (Daif)

"The Messenger of Allah said: 'The Muslim does not have to pay Sadaqah on his slave or his horse."'