It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), he says: When it was the night of the jinn, two individuals among them stayed behind and they said: "O Messenger of Allah! We will perform the Fajr prayer with you." The Prophet (peace and blessings be upon him) said to me: "Do you have water?" I said: "I do not have water, but I have nabidh in a vessel." The Prophet (peace and blessings be upon him) said: "Pure dates and purifying water."