Musannaf Ibn Abi Shayba 28:725

Waki’ narrated to us, he said: Usama bin Zayd narrated to us, from al-Zuhri, from Humayd bin ‘Abd al-Rahman, he said: ‘Umar said: "That I should rescue a man from the Muslims from the hands of the disbelievers is more beloved to me than the Arabian Peninsula."