A man was often cheated in buying. The Prophet (ﷺ) said to him, "When you buy something, say (to the seller), No cheating." The man used to say so thenceforward .
Sahih al-Bukhari Book 44, Hadith 5
← Previous Hadith A Jew crushed the head of a girl between two stones. The girl was asked who had crushed her head, and some names were mentioned before her, and when the name of the Jew was mentioned, she nodded agreeing. The Jew was captured and when he confessed, the Prophet (ﷺ) ordered that his head be crushed between two stones.

Sahih al-Bukhari Book 44, Hadith 4 Next Hadith → A man manumitted a slave and he had no other property than that, so the Prophet (ﷺ) canceled the manumission (and sold the slave for him). Nu'aim bin Al-Nahham bought the slave from him.

Sahih al-Bukhari Book 44, Hadith 6