Does selling an item to someone with a favorable price reduction (*muḥābāh*) break an oath sworn against giving a gift?

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Selling an item with a favorable price reduction does not break the oath against giving a gift, because the transaction is a sale based on exchange (*muʿāwaḍa*). This is supported by the fact that a pre-emption claimant (*shafiʿ*) has the right to take the entire sold item, which would not be the case if part of it were considered a gift.