It was narrated that Usamah bin 'Umair Al-Hudhali said:
"The Messenger of Allah said: 'Allah does not accept any prayer without purification and He does not accept any charity from Ghulul.'" (Sahih)Another chain with similar wording. (RU)
English reference (RU): Vol. 1, Book 1, Hadith 271 (RU)
Arabic reference (RU): Book 1, Hadith 283 (RU)