It was narrated that Anas bin Malik said:
"I heard the Messenger of Allah say: 'Allah does not accept any prayer without purification, and He does not accept any charity from Ghulul.'" (RU)
English reference (RU): Vol. 1, Book 1, Hadith 273 (RU)
Arabic reference (RU): Book 1, Hadith 286 (RU)