or to belligerents or highway bandits; nor may a Muslim slave be sold to an unbeliever who would not thereby be obliged to set him free.1 Likewise, it is impermissible to sell over a fellow Muslim’s sale by saying to someone who has bought an item for ten, “I will sell you the same for nine,” or to purchase over his purchase2 by telling a seller who has agreed to sell something for nine, “I will give you ten.”
Bidding on a Muslim’s bid once the first party has given explicit consent, selling a Qur’an codex, and selling a slave-woman with whom the owner has had intercourse before her womb has been cleared are all forbidden, yet the contract itself remains valid.
No act of disposal is valid with respect to property received under a corrupt contract; the recipient is liable for the item and for any increase, just as in the case of usurped goods.