question #1 Sahih al-Bukhari 2079, Book 34, Hadith 32 : What are the ethical guidelines for buyers and sellers in a transaction according to Islamic teachings?

Allah’s Messenger (ﷺ) said, “The seller and the buyer have the right to keep or return goods as long as they
have not parted or till they part; and if both the parties spoke the truth and described the defects and
qualities (of the goods), then they would be blessed in their transaction, and if they told lies or hid
something, then the blessings of their transaction would be lost.”