(64) باب النَّهْىِ لِلْبَائِعِ أَنْ لاَ يُحَفِّلَ الإِبِلَ وَالْبَقَرَ وَالْغَنَمَ وَكُلَّ مُحَفَّلَة
Narrated `Abdullah bin Mas`ud:
Whoever buys a sheep which has not been milked for a long time, has the option of returning it along with one Sa of dates; and the Prophet (ﷺ) forbade going to meet the seller on the way (as he has no knowledge of the market price and he may sell his goods at a low price).
Reference: Sahih al-Bukhari 2149
In-book reference: Book 34, Hadith 101
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 359