Jami' al-Tirmidhi The Book on Business Abdul Warith bin Sa'id bin Dhakwan عبد الوارث بن سعيد بن ذكوان Amr bin Shu'aib bin Muhammad عمرو بن شعيب بن محمد السهمي Qutayba bin Sa'id bin Jamil قتيبة بن سعيد بن جميل Shu'aib bin Muhammad bin 'Abdullah شعيب بن محمد بن عبد الله بن عمرو Yahya bin Abi Anisa يحيى بن أبي أنيسة That the Prophet (ﷺ) said: “Whoever purchases an animal that has not been milked, then he retains the option for three days. If he returns it, then he is to return with it a Sa’ of food, not Samra’ ” The meaning of “Not Samra'” is “not wheat.” This Hadith is Hasan Sahih. This Hadith is acted upon according to our companions, among them Ash-Shafi’i, Ahmad, and Ishaq. https://parallelquran.com/hadith/jami-al-tirmidhi-1256/