In which matters concerning the termination of the waiting period (Iddah) should a husband's claim against his wife be accepted?

Primary text

If a husband claims his wife informed him of the end of her Iddah during a period when termination is permissible, and she denies it, the husband's statement is accepted regarding matters between him and God, specifically permitting him to marry her sister and four others besides her in outward legal effect. This acceptance is because his statement concerns a right pertaining solely to himself. This view is held by Al-Shafi'i and others. The justification rests on the principle that a single statement containing both the nullification of another's right and the establishment of his own right without harm to the other party must be partially accepted, analogous to confirming freedom but denying the right to reclaim the purchase price when admitting a prior manumission.