Musannaf Ibn Abi Shayba 3:1773

Zayd ibn al-Hubab narrated to us, from Mu'awiyah ibn Salih, who said: Malik ibn Ziyad informed us, saying: 'Umar ibn 'Abd al-'Aziz led us in prayer, and he began the prayer with "Al-hamdu lillahi rabbil-'alamin" (Praise be to Allah, Lord of the worlds).