Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said: "When you pay the zakat of your wealth, you have fulfilled the obligatory duty upon you. And whoever gathers wealth in a forbidden manner and then gives it in charity, he will not receive its reward; rather, its burden will remain upon him."
Hadith Referenceصحیح ابن حبان / كتاب الزكاة / 3216
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيحسن - «التعليق الرغيب» (1/ 266).فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده حسن