Yahya said that he heard Malik say about someone who consumes some food without the permission of its owner, "He returns to the owner a like weight of the same kind of food. Food is in the position of gold and silver. Gold and silver are returned with gold and silver. The animal is not in the position of gold in that. What distinguishes between them is the sunna and the behaviour which is in force.
Yahya said that he heard Malik say, "If a man is entrusted with some wealth and then trades with it for himself and makes a profit, the profit is his because he is responsible for the property until he returns it to its owner. "