Abu Rafi (may Allah be pleased with him) narrated that :
the Messenger of Allah sent a man from Banu Makhzun to collect charity, so he said to Abu Rafi: Accompany me so that perhaps you may have some of it. So he said: Not until I ask the Messenger of Allah. So he went to the Prophet to ask him, and he said: Charity is not lawful for us, and to be the Mawda of a people to be the same as them.