It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A man should not make a sale over the sale of his brother, nor make a marriage proposal over the proposal of his brother; do not deceive one another by bidding (merely to raise the price, without intending to buy); a town-dweller should not sell on behalf of a desert-dweller; and a woman should not ask for her sister to be divorced so that she may empty out what is in her vessel, for she will get only what has been written for her. And do not hold back the milk of camels and sheep (in their udders to sell them). Whoever buys an animal whose milk has been held back has the choice of the better of two options: if he returns it, he should return a sa' of dates with it."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith about the musarrah (animal whose milk has been held back) from al-Zuhri (may Allah have mercy on him) except Sulayman bin Kathir; Muhammad bin Kathir is alone in narrating it."