Abd al-Rahman says that his father (may Allah be pleased with him) heard the Messenger of Allah (peace and blessings be upon him); he (peace and blessings be upon him) said: "The example of the man who plays nard and then prays is like one who performs ablution with pus and the blood of swine and then stands to pray."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20953