Musannaf Ibn Abi Shaybah 23544 — A man who buys an animal with milk

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Whoever buys a musarrah goat (a goat whose owner stopped milking it some days before selling it so that the buyer would think it gives more milk) has the choice: if he wishes, he may return that goat and give one sa' of dates in exchange for the milk he has used.