Musnad Ahmad 27:1282

Aswad ibn Amir narrated to us, Baqiyyah ibn al-Walid al-Homsi narrated to us, from Uthman ibn Zafar, from Hashim, from Ibn Umar, who said: "Whoever buys a garment for ten dirhams, and there is a haram dirham in it, Allah will not accept a prayer from him as long as it is upon him." He said: Then he inserted his two fingers into his ears, and then said: "May they go deaf if I did not hear the Prophet, may Allah bless him and grant him peace, say it."