Musannaf Ibn Abi Shayba 13:501

Abu Bakr narrated to us, he said: Yahya ibn Abi Za'idah narrated to us, from 'Abd al-Malik, from 'Ata', regarding a man who bought an item for sale, then said: "I do not have cash, I will buy it on credit." He said: "When it becomes like a sale, he may buy it if he wishes."