Is it permissible for a third party to offer a better deal to a buyer who still has the option to revoke the purchase (Khiyar)?

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It is not permissible for a man to approach a buyer who has already engaged in a transaction and still holds the option of revocation (*khiyar*). If this third party offers to sell the buyer an identical commodity for a lower price, or a superior commodity for the same price or less, and the buyer subsequently revokes the initial sale to acquire the offered item, this action is forbidden. This prohibition stems from the Prophet's saying, 'No one among you should buy upon the purchase of his brother,' and because this conduct causes harm to the Muslim and corrupts his dealing.