Musannaf Ibn Abi Shayba 13:1260

Abu Bakr narrated to us, he said: Ibn ‘Ulayyah narrated to us, from Yunus, from Ibn Sirin, who said: Abu ‘Ubaydah ibn ‘Abd Allah ibn Mas‘ud said to me: Do not take gold for silver if you have a claim against a man, and do not take silver for gold.