It is narrated from Hazrat Abu Huraira that the Noble Prophet, peace and blessings be upon him, said: When any one of you gets up at night, he should not put his hand into the vessel before washing it three times. Because he does not know where his hand spent the night.

It is narrated from Hazrat Abu Huraira that the Messenger of Allah, peace and blessings be upon him, said: When any one of you wakes up from sleep, he should pour water over his hand three times before putting it into the vessel, for he does not know where his hand spent the night.

It is narrated from Hazrat Abu Hurairah that the Messenger of Allah, peace and blessings be upon him, said: When any one of you gets up at night, he should not put his hand into the vessel until he has washed it.

It is narrated from Ibrahim that when a person wakes up from his sleep, he should not put his hand into the vessel until he washes it. And (Imam) Abu Hanifa's opinion is mentioned that: there is no harm in it.