Sayyidah Aishah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) said: "Charity (zakah) never mixes with any wealth except that it destroys it." And in a narration of al-Shafi'i (may Allah have mercy on him), the Messenger of Allah (peace and blessings be upon him) said: "Charity never mixes with any wealth except that it destroys it."
Abu Ahmad (Ibn Adi) said: I do not know of anyone other than him (Muhammad bin Uthman bin Safwan) who narrated it from Hisham bin Urwah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7666