Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Qais bin Abi Hazim, he says that in the place of Mada'in, a man fell ill. The narrator says: In my opinion, he was a hypocrite, so Hazrat Hudhaifa (may Allah be pleased with him) said: Take this man to the water of the Euphrates, because the water of the Euphrates is lighter than the water of the Tigris. The narrator says: So the man was taken there, and he died.