Ibrahim (may Allah have mercy on him) said that when the master comes to the people of the market and informs them that he has prohibited his slave from trading, then it is not permissible for anyone to conduct transactions with him.

Hasan (may Allah have mercy on him) says that if a person prevents a slave in the market from transacting or doing anything in front of the people of the market, then it is not permissible to buy or sell with him.

Hazrat Ibn Sirin (may Allah have mercy on him) did not consider being prevented from trade to be of any significance.

It is narrated from Hazrat Bakr Al-Anazi (may Allah have mercy on him) that a man forbade his slave from trading. The slave took the matter to Hazrat Ali (may Allah be pleased with him). Hazrat Ali (may Allah be pleased with him) asked the owner, "Do you give him dirhams and send him to buy meat and such things?" He replied, "Yes." Upon hearing this, Hazrat Ali (may Allah be pleased with him) permitted the slave to engage in trade.

Ibrahim (may Allah have mercy on him) said that a free person should not be prevented from engaging in trade.

Hazrat Husain (may Allah have mercy on him) narrates that I was present with Hazrat Shurayh (may Allah have mercy on him) when a man came along with his nephew, against whom he was seeking help. The man submitted that his nephew consumes a lot of intoxicating substances (he was referring to alcohol). Hazrat Shurayh (may Allah have mercy on him) said, "Stop giving him pocket money and spend on him in a good manner." Hazrat Husain (may Allah have mercy on him) states that the nephew had already grown a beard.

It is narrated from Hazrat Abdul Malik bin Mughirah, may Allah have mercy on him, that Najdah wrote to Hazrat Ibn Abbas, may Allah be pleased with them both, and inquired about the ruling regarding an old man whose intellect has vanished or who has become unintelligent. He, may Allah be pleased with him, wrote to him that when his intellect vanishes or he becomes unintelligent, he should be prevented from trade and similar activities.

It is narrated in a similar manner from Hazrat Ibn Abbas (may Allah be pleased with them both).

Hazrat Shurayh (may Allah have mercy on him) says that due to foolishness (a slave girl or slave) will be returned.

Hazrat Zaid Abu al-Ma'la (may Allah have mercy on him) narrates that I was present with Hazrat Iyas bin Mu'awiyah (may Allah have mercy on him), when a dispute regarding a slave girl was brought before him. One person said, "I bought this slave girl from him, but she is foolish." The other said, "I do not know that she would be returned due to foolishness." The first person submitted, "Foolishness is also like insanity." Hazrat Iyas (may Allah have mercy on him) asked the woman (slave girl) in Persian, "Do you remember the night in which you were born?" She replied, "Yes." He (may Allah have mercy on him) asked her, "Which of your legs is longer?" She pointed to one leg and said, "This one." Thus, she was returned to her previous owner.