Rulings of Prayer
Dress code: Part four
One of the necessary conditions of the clothes worn during prayer is that they must be Mubāḥ (not Ghaṣbī).
Meaning they should not have been seized from another person unlawfully or used without their consent.
Also it should not be obtained with money earned through illegitimate means or with money the Khums or Zakat of which have not been paid.
In case one buys some clothes on credit but they intended not to pay their debt the clothe are considered Ghaṣbī and prayer in such clothes is void.
If a person purposefully performs prayers in Ghaṣbi clothes even as small as a button or a piece of a thread, their prayer is void and must be reperformed.
However, if a person was unaware that their clothes where Ghaṣbi, the prayer is valid.
Also, if a person was aware that their clothes were Ghaṣbi but they had forgotten about it, their prayer is valid unless they themselves were the actual person who had committed Ghaṣb (unlawful seizure) in which case, based on the obligatory precaution, the prayer needs to be reperformed.
It is noteworthy that a prayer performed wearing a Ghaṣbi belt or ring is valid (because they are not clothes), however the person committing Ghaṣb still has perpetrated a Harām act.