Musannaf Ibn Abi Shayba 9:1492

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, from Ibn 'Awn, from Muhammad, he said: I asked 'Ubaydah about His saying: "Concerning the orphan women to whom you do not give what is prescribed for them, and whom you desire to marry," he said: "You desire them."