Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) narrated: We discussed the ritual bath (ghusl) for major impurity (janabah) in the presence of the Prophet (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) said: "As for me, I pour water over my head several times, and in this way I wash my head from major impurity."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1469