Chapter on the Impediments to Testimony
They are six:1
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That the witness—or any part of him—belongs to the person in whose favour he testifies,2 and the same applies if he is, or once was, that person’s spouse, or if he is one of his descendants, however remote, through sons or daughters, or one of his ancestors, however far back. Testimony is accepted for his other relatives, such as a brother; and whenever a man’s testimony is inadmissible in someone’s favour, it is admissible against him.
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That he would, by his testimony, draw a benefit to himself. Accordingly, his testimony is not accepted for his slave or his mukātib (slave under a manumission contract), nor for a person from whom he will inherit concerning a wound before it heals, nor for his partner regarding the property in which they share, nor for his lessee with respect to the subject of the lease.
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That he seeks, by it, to avert harm from himself. Thus the testimony of the ʿāqila (the male agnates who pay blood money) to impeach the witnesses of an accidental killing is not accepted, nor the testimony of creditors to impeach the witnesses to a debt against an insolvent debtor, nor the testimony of a guarantor in favour of the one he guaranteed, whether by alleging payment of the debt or its discharge. The testimony of anyone whose evidence is inadmissible in a person’s favour is, however, accepted to impeach a witness against him.
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Enmity that is not for the sake of Allah Most High—such as rejoicing at another’s misfortune,3 grieving at his happiness, or wishing him harm. A person’s testimony against his enemy is therefore not accepted, except in the case of a marriage contract.