Musannaf Ibn Abi Shaybah

Hazrat Aisha (may Allah be pleased with her) narrates that the Noble Prophet (peace and blessings be upon him) performed the ghusl of janabah in such a way that he first washed both his hands three times, then performed the ablution as for prayer. Then he placed his hand on his hair and ran his fingers through it so that water reached the scalp. Then he poured water over his head three times, then poured water over his entire body.