Forgetting an obligatory act while performing Wudu'

Q: What is the ruling on someone who forgets to perform an obligatory act of Wudu' (ablution)?

A: All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.Anyone who is performing Wudu’ should be keen on performing it perfectly, observing the correct order and preserving the continuity of steps, after the example of the Prophet (peace be upon him). It is related on the authority of Himran, the freed slave of `Uthman who said: `Uthman ibn `Affan called for water to perform Wudu’. He poured water from the vessel over his hands and washed them three times. Then he put his right hand in the ablution water, rinsed his mouth and sniffed water in and out his nose. Then he washed his face three times, then his arms up to the elbows three times. Then he wiped over his head, then he washed each foot three times. After that, he said: “I saw the Prophet (peace be upon him) performing Wudu’ the way I did and he said, ‘Whoever performs Wudu’ as I have done it (Part No. 5; Page No. 231) then offers two Rak‘ahs (units of prayer) during which he does not think of anything else, Allah will forgive him his past sins.’” (Agreed upon by Al-Bukhari and Muslim) Consequently, anyone who forgets one of the above-mentioned obligatory acts of Wudu’, such as washing the face or hands, their Wudu’ is invalidated.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.