Jami` at-Tirmidhi, Book 14, Hadith 52 (In-Book) ⓘ
Narrated Abu Hurairah: That the Prophet 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' " [Abu 'Eisa said:] 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.
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا أَبُو عَامِرٍ، حَدَّثَنَا قُرَّةُ بْنُ خَالِدٍ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنِ اشْتَرَى مُصَرَّاةً فَهُوَ بِالْخِيَارِ ثَلاَثَةَ أَيَّامٍ فَإِنْ رَدَّهَا رَدَّ مَعَهَا صَاعًا مِنْ طَعَامٍ لاَ سَمْرَاءَ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ . وَالْعَمَلُ عَلَى هَذَا الْحَدِيثِ عِنْدَ أَصْحَابِنَا مِنْهُمُ الشَّافِعِيُّ وَأَحْمَدُ وَإِسْحَاقُ . وَمَعْنَى قَوْلِهِ " لاَ سَمْرَاءَ " . يَعْنِي لاَ بُرَّ .
also referenced under: Hadith 1252 (Reference) & Volume 3, Book 12, Hadith 1252 (DarusSalam)