The Ruling on Selling on the Sale of a Muslim and Buying on His Purchase

Question:
Among his questions, he also asks: What is the ruling on a Muslim selling over his brother's sale and buying over his purchase?

Answer:
This is forbidden. The Messenger of Allah (peace and blessings be upon him) said: The same applies to buying over his purchase, because this is encroaching on the right of the Muslim, so it is not permissible for him to do so. Even regarding the offer: if someone makes an offer and the seller intends to sell to him, he should not step forward and say, "I have a higher offer." If he sees that the seller is inclined to sell, he should not leave him. However, if the offer is still standing and the bidding is ongoing, there is no harm in increasing the offer. Yes.