Question 28: Some people said that it is not necessary to perform Wudoo’ (ablution) in order, so it is permissible to wash the feet before the hands or face. They also claimed that Istinjaa’ (cleansing one’s private parts with water after urination or defecation) is not necessary as long as one has not urinated.
Likewise, it is not required to be done on waking up from sleep. We hope that your Eminence will enlighten us concerning this issue, so that we will be sure of matters of importance in our religion. May Allaah grant you success!
Answer: It is obligatory to follow the prescribed order of Wudu’ starting with washing the face, two hands and elbows, wiping the head and two ears and then washing the feet and heels as related in the honorable Aayah (Al-Maa’idah: 6) and in accordance with what the Prophet (peace be upon him) did. Moreover, the Prophet (peace be upon him) said.. read more here.