Maliks Muwatta Book 002, Hadith Number 007.

Section : How to do Wudu.

Yahya said that Malik was asked what a man should do if, when he did wudu, he forgot and washed his face before he had rinsed his mouth, or washed his forearms before he had washed his face. He said, "If someone washes his face before rinsing his mouth, he should rinse his mouth and not wash his face again. If someone washes his forearms before his face, however, he should wash his forearms again so that he has washed them after his face. This is if he is still near the place (of wudu)."