Yahya related to me from Malik that he had heard that Abdullahibn Umar said, "O Allah, make me one of the leaders of the people oftaqwa ."Allahumma jalniy min a'imati'l-mutaqin. (IT)
USC-MSA web (English) reference: Book 15, Hadith 42 (IT)
Arabic reference (IT): Book 15, Hadith 514 (IT)