Umm al-Mu'mineen Sayyidah Aisha (may Allah be pleased with her) narrates: She heard the Prophet Muhammad (peace and blessings be upon him) say: "Charity (i.e., zakat wealth) when mixed with any other wealth destroys it." The Prophet Muhammad (peace and blessings be upon him) said: "Sometimes zakat becomes obligatory upon your wealth, and if you do not give it, the unlawful destroys the lawful."