Musannaf Ibn Abi Shayba 1:1778

Abu Dawud narrated to us, from Ibn Abi Dhi'b, who said: My brother informed me, saying: I asked al-Qasim about the moisture I find during prayer. He said: "O son of my brother, sprinkle it and ignore it, for it is only from Satan." He said: So I did that, and it went away from me.