The prohibition "do not covet"
4. It is permissible to ask someone to sell an item, provided this does not violate ethical principles or standards of conduct. However, if the owner refuses, it is forbidden to keep thinking about the item while looking for ways to acquire it. This is a violation of the prohibition "do not covet." In this case, it makes no difference what item or object is involved. The prohibition is violated even if a large sum was offered and many people were sent to the owner to persuade him to make the sale. (The fact that he eventually agreed to sell does not mean that the way the transaction was brought about was kosher.)
Someone who implores another person to share his wisdom and teach him for payment does not violate the prohibition, since no material object is involved.
6. This law applies to anyone who compelled (forced) someone else to sell him an item. A transaction made under pressure is valid, and the seller cannot change his mind. Nevertheless, someone who buys something in this way is considered a robber: he has violated a Torah prohibition, and his testimony is not accepted in court.
The violation occurs even when the seller suffers only a small loss while the buyer gains a great deal, and even if he pays the seller a large sum (for example, someone asks his neighbor to sell him a storage room so that he can expand his apartment, saying, "You hardly use that storage room anyway")
7. Let us sum up. Someone who intensely desires to acquire what belongs to another person violates one Torah prohibition. Someone who desires it and keeps persuading the other person to sell until he gives in to the pressure and sells violates two prohibitions: "Do not covet" and "Do not desire." However, there is an opinion that these last two statements refer to the same Torah prohibition.
Someone who steals another person’s property violates the commandment "Do not steal" in addition to the first two prohibitions.
**** There was a prize drawing during Hanukkah, and Yaakov won a very beautiful building set. Avraham, who was several years older than Yaakov, also received gifts. But when he saw the new building set, he immediately wanted to trade with his younger friend. Avraham thought about how to intimidate Yaakov and force him to hand over the building set. (At that moment, he violated the prohibition "do not desire.") Then the boy chose a convenient moment and showed his younger friend the new books he had received for Hanukkah. Yaakov immediately understood what his friend had in mind and did not respond. Then Avraham put on a sad expression and said that he actually already had a book like that at home, while the only gift he had ever wanted was a building set.
But Yaakov did not respond to that either. Then Avraham sent his friends to persuade him to exchange gifts. Seeing that nothing was helping, Avraham began behaving very harshly. He threatened Yaakov and insulted him in front of their classmates. When the boy returned home, he told his parents everything that had happened. His father listened and said: "I’m very glad you didn’t give in to Avraham. Now your friend will have one fewer transgression. After all, wanting something is one thing, and taking an item away from someone without his consent is another."