Musannaf Ibn Abi Shayba 1:703

703. Ibn ‘Ulayyah narrated to us, from Yunus, from al-Hasan, that the Prophet of Allah, may Allah bless him and grant him peace, was asked by some people from the people of Ta’if: "Our land is cold, so what suffices us regarding the ghusl (ritual bath)?" He said: "As for me, I pour three handfuls of water over my head."