Yahya related to me from Malik from Yahya ibn Said that a manused to lead the people in prayer in al-Aqiq (a place near Madina),and Umar ibn Abd al-Aziz sent a message to him forbidding him to doso.Malik said, "He only forbade him because his father wasnot known."
App reference: Book 8, Hadith 16
USC-MSA web (English) reference: Book 8, Hadith 16
Arabic reference: Book 8, Hadith 305