Sahih Muslim Book 002, Hadith Number 0433.
Chapter : Purification is essential for prayer.
Mus'ab b. Sa'd reported: 'Abdullah son of Umar came to Ibn'Amir in order to inquire after his health as he was ailing. He said Ibn 'Umar, why don't you pray to Allah for me? He said: I heard of Allah's Messenger (may peace be upon him) say: Neither the prayer is accepted without purification nor is charity accepted out of the ill-gotten (wealth), and thou wert the (governor) of Basra.