Hadith 5:633
Waki' narrated to us, he said: Sufyan and Hasan used to say: "One who possesses fifty dirhams is not to be given from it [zakat/charity]. And one is not to be given from it more than fifty, unless he has a debt upon him; so his debt is to be paid, and he is given after [reaching] fifty."
حدثنا وكيع قال كان سفيان وحسن يقولان لا يعطى منها من له خمسون درهما ولا يعطى منها أكثر من خمسين إلا أن يكون عليه دين فيقضى دينه ويعطي بعد خمسين