Narrated 'Umar: The Messenger of Allah ﷺ as saying: Gold for gold is interest unless both hand over on the spot ; wheat for wheat is interest unless both hand over on the spot ; dates for dates is interest unless both hand over on the spot ; barley for barley is interest unless both hand over on the spot.
This hadith also teaches us that Allah has given us a great responsibility to ensure justice and fairness in our dealings with others so that no one is taken advantage of or harmed financially because of our actions. We should always strive to do what is right even if it means sacrificing something ourselves in order to help another person out.