Abdullah bin Wahb عبد الله بن وهب بن مسلم القرشي · Wages (Kitab Al-Ijarah)

The Prophet (ﷺ) said: If anyone makes two transactions combined in one bargain, he should have the lesser of the two or it will involve usury.

In the time of the Messenger of Allah (ﷺ) a man suffered loss affecting fruits he had bought and owed a large debt, so the Messenger of Allah (ﷺ) said: Give him sadaqah (alms). So the people gave him sadaqah (alms), but as that was not enough to pay the debt in full, the Messenger of Allah (ﷺ) said: Take what you find. But that is all you may have.

The Messenger of Allah (ﷺ) as saying: If you were to sell dried dates to your brother and they were smitten by blight, it will not be allowable for you to take your brother's property unjustly.

Blight means anything which obviously damages (the crop), by rain, hail, locust, blast of wind, or fire.

The Messenger of Allah (ﷺ)forbade the price paid for a dog.

The Prophet (ﷺ) said: The price paid for a dog, the price given to a soothsayer, and the hire paid to a prostitute are not lawful.

They (the people) used to buy grain in the upper part of the market in the same spot without measuring or weighing it. The Messenger of Allah (ﷺ) forbade them to sell it there before removing it.

The Prophet (ﷺ) said: If a man sells (his) property and the man who buys it becomes insolvent, and the seller does not receive the price of the property he had sold, but finds his very property with him (i.e. the buyer), he is more entitled to it (than others). If the buyer dies, then the owner of the property is equal to the creditors.

The Prophet (ﷺ) said: It is not lawful for a man to make a donation or give a gift and then take it back, except a father regarding what he gives his child. One who gives a gift and then takes it back is like a dog which eats and vomits when it is full, then returns to its vomit.

The Prophet (ﷺ) said: The similitude of the one who takes back what he gifted is like that of a dog which vomits and then it eats vomit. When a donor seeks to take back (his gift), it should be made known and he informed why he sought to take it back. Then whatever he donated should be returned to him.