Musannaf Ibn Abi Shayba 13:2809

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Sufyan narrated to us, from Khalid ibn Dinar, from ‘Amir, regarding a man who lends a loan to a man and intends that he will repay him with something better than it. He said: "That is the most wicked of it."