Musannaf Ibn Abi Shayba 13:3049

Abu Bakr narrated to us, he said: Yunus ibn Abi Ishaq narrated to us, from his father, from Sa'id ibn Wahb: That Mu'adh bargained with a man over a sale, and he (the man) swore that he would not sell it to him. Then he (the man) invited him to sell it to him, so he (Mu'adh) disliked to buy from him.