Musannaf Ibn Abi Shayba 9:1791

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, from Hammad bin Zayd, he said: Asim narrated to us, he said: Umar bin al-Khattab said: "You must marry the virgins among women, for they are sweeter in speech, healthier in wombs, and more easily satisfied with little."