Musannaf Ibn Abi Shayba 1:1395

Ibn ‘Ulayyah narrated to us, from Hisham al-Dastawa’i, from Yahya ibn Abi Kathir, from a man from the Ansar, from Abu Hurayrah, who said: Two waters do not suffice for the ritual bath (ghusl) from major impurity (janabah): seawater and the water of the bathhouse.