Musnad Ahmad 1153:1172

Yahya ibn Hammad narrated to us, Abu 'Awanah narrated to us, from 'Abdullah ibn Abi al-Safar, from Mus'ab ibn Shaybah, from Talq ibn Habib, from 'Abdullah ibn al-Zubayr, from 'Aishah, from the Prophet, peace and blessings of Allah be upon him, that he said: "He performs ghusl (ritual bath) for four: for Jumu'ah (Friday prayer), for janabah (major ritual impurity), for cupping, and for washing the dead."