Hadith #3444 (Sunan Abi Dawud)
Book: Wages (Kitab Al-Ijarah)
Narrator(s): Abdullah bin Mkhld عبد الله بن مخلد, Abu Hurairah, Ibn Jurayj ابن جريج, Makki bin Ibrahim bin Bashayr مكي بن إبراهيم بن بشير, Ziyad bin 'Alaqa زياد بن علاقة
Grade: Sahih

The Prophet (ﷺ) as saying: If anyone buys sheep whose udders have been tied up, he has option for three days: he may return it if he desires with a sa’ of any grain, not (necessarily) wheat.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3444/