Sunan Ibn Majah, Chapter: The Chapters of Purification and its Sunnah

that the Messenger of Allah (saw) called for water and performed ablution washing each part once. He said: "This is the miminun requirement of ablution' or he said: 'The ablution of one who, if he does not perform this ablution, Allah will not accept his prayer." Then he performed ablution washing each part twice, and he said: 'This is the ablution of one who, if he performs it, Allah will give him two shares of reward." Then he performed ablution washing each part three times, and said: 'This is my ablution and the ablution of the Messengers who were sent before me." (Daif)