Musnad Abu Ya'la al-Mawsili 148:1

Abu Bakr ibn Abi Shaybah narrated to us, Yunus narrated to us, from Layth, from Yazid ibn Abi Habib, from Ibn Sinan, from Anas ibn Malik, from the Messenger of Allah (may Allah bless him and grant him peace), who said: "No charity is accepted from ghulul (ill-gotten gains), and no prayer is accepted without purification."