Hasan (may Allah have mercy on him) said that there is no harm in selling an unbroken glass in exchange for a broken glass, provided that the unbroken one is better, and Ibn Sirin disliked this unless they are equal.

23537 - And Ibn Sirin used to dislike that, except if it was weight for weight.

It is narrated from Hasan that the Holy Prophet (peace and blessings be upon him) said: Milk should not be mixed (with water or anything else) for the purpose of selling it.

Ibrahim disliked breaking dirhams with the vegetable seller, that he would break dirhams with him and take from him anything other than what he had taken in it.

Hazrat Ibn Sirin (may Allah have mercy on him) disliked giving dirhams quickly to the vegetable seller. Then he inquired about this from Hasan. He replied, "By Allah, this has not reached us."

23541 - Al-Hasan was asked about that, and he said: By Allah, this has not reached us.

Hazrat Ibn Sirin says that if a person gives a dirham to a vegetable seller, he said that he should not take except that which was entrusted, and if it is kept with him, then he may take it whenever he wishes.

Muhammad, may Allah have mercy on him, disliked that a dirham be given to a vegetable seller and the sale (the goods) be taken from him, but he approved that goods be taken from him, and when the goods reach the value of one dirham, then the dirham be given to him.

It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: Whoever buys a Musarrat goat (a goat whose owner has stopped milking it for a few days before selling it so that the buyer thinks it gives more milk), he has the option; if he wishes, he may return the goat, and for the milk he has used, he should give one sa’ of dates in exchange.

The Prophet Muhammad (peace be upon him) said that whoever buys a musarrat goat has two options: if he wishes to return it, he should give along with it one sa’ of dates or one sa’ of wheat.