Musannaf Ibn Abi Shayba 1:689

Ibn Fudayl narrated to us, from Yazid ibn Abi Ziyad, who said: I asked Abd al-Rahman ibn Abi Layla about the ritual bath (ghusl) from major ritual impurity (janaba). He said: You wash your palms, then you pour with your right hand onto your left, then you wash your private parts. Then you wash your hands, then you perform your ablution (wudu) for prayer.