Bilal brought the Messenger of Allah ﷺ some Barni dates.The Messenger of Allah ﷺ asked, "What is this?"Bilal replied, "I bought it, one measure for two."The Messenger of Allah ﷺ said, "Ah, this is the very essence of riba. Do not go near it."
أخبرنا هشام بن عمار عن يحيى وهو ابن حمزة قال حدثنا الأوزاعي قال حدثني يحيى قال حدثني عقبة بن عبد الغافر قال حدثني
أتى بلال رسول الله ﷺ بتمر برني فقال ما هذا قال اشتريته صاعا بصاعين فقال رسول الله ﷺ أوه عين الربا لا تقربه
No references are available.
Bukhari narrated it in "Agency," chapter "If the agent sells something defective, the sale is void," hadith 2312, and Muslim in "Sharecropping," chapter "Selling food for equal amounts," hadith 96/1594, from the hadith of Yahya bin Abu Kathir through this same chain. It is also found in Al-Kubra, hadith 6149.