Musannaf Ibn Abi Shayba 1:697

697. Hafs narrated to us, from Ja'far, from his father, from Jabir, who said: I said, "O Messenger of Allah, I am in a cold land, so how should I perform the ghusl (full ablution) for janaba (major ritual impurity)?" He said, "As for me, I pour three handfuls of water over my head."