Referring to Islamic teachings for guidance before making any decisions or opinions on our own

This hadith discusses the prohibition of exchanging like items if extra is given. It was narrated by Abu Jawza', who heard Ibn 'Abbas allowing exchange and then taking back his opinion. When he met him in Makkah, he asked him about it and Ibn 'Abbas confirmed that he had taken back his opinion because Abu Sa'eed narrated from the Messenger of Allah that he forbade exchange if extra was given. This hadith teaches us to be careful when making decisions as we should always refer to the teachings of Prophet Muhammad ﷺ before making any decisions or opinions on our own. We should also be aware that even though we may have an opinion on something, it may not necessarily be correct according to Islamic teachings and so we must always refer back to them for guidance.