ENOfficial
Narrated Abu Hurairah: That the Prophet (ﷺ) said: "Whoever purchased an animal that has not been milked, then he the choice when he milks it, if he wishes he may return it, returning a Sa' of dried dates along with it." There are narration on this topic from Anas, and a man from the Companions of the Prophet (ﷺ).
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا وَكِيعٌ، عَنْ حَمَّادِ بْنِ سَلَمَةَ، عَنْ مُحَمَّدِ بْنِ زِيَادٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " مَنِ اشْتَرَى مُصَرَّاةً فَهُوَ بِالْخِيَارِ إِذَا حَلَبَهَا إِنْ شَاءَ رَدَّهَا وَرَدَّ مَعَهَا صَاعًا مِنْ تَمْرٍ " . قَالَ أَبُو عِيسَى وَفِي الْبَابِ عَنْ أَنَسٍ وَرَجُلٍ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم .
sunnah.com