It was narrated from 'Abdullah bin Mas'ud that on the night of the jinn, the Messenger of Allah said to him: "Do you have water for ablution?" He said: "No, I have nothing but some Nabidh in a vessel." He said: "Good dates and pure water. (i.e., there is no harm from the mixing of the two)." So he performed ablution with it. This is the narration of Waki.