A vessel of water was brought to the Prophet (PBUH) and he performed ablution (Wudu'). Amr Ibn 'amer said: I said to Anas: Did the Prophet perform ablution at every prayer? Anas replied: Yes. Amr Ibn 'Amer said: And you? Anas replied: We used to perform the prayers with one ablution. Amr Ibn 'Amer said: Then I asked him after that, and he said: As long as we did not commit minor ritual impurities.