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Ruling 136

There is no problem in selling or lending an impure object that can be made pure. However, it is necessary to tell the other party about the object being impure on two conditions:

  1. The other party is in risk of opposing a legal responsibility; for example, he uses it in his food or drink. However, if this is not the case, it is not necessary to inform him; for example, it is not necessary to inform him about impure clothing with which he performs prayers because wearing pure clothing is not an absolute condition (al‐sharṭ al‐wāqiʿī)17 for the prayer to be valid;
  2. One deems it probable that the other party will give heed to what he says. Therefore, if one knows that what he says will have no effect, it is not necessary to tell him.

17 An absolute condition is one that must be fulfilled for an action to be valid irrespective of the performer’s state of knowledge with regard to that condition. For example, performing rukūʿ in prayers is an absolute condition for the prayer to be valid because even if a person omits it unknowingly and realises this afterwards, his prayer is void and he must repeat it. However, wearing pure clothing in prayers is not an absolute condition because if one performs prayers with impure clothing and realises this afterwards, his prayer is deemed to be valid.