Nasai

(1) From the decision of Uthman (radi Allahu anhu), it is understood that one menstrual period (‘iddah) is also for istibra’ al-rahm, that is, to ascertain the cleanliness of the womb. If there has been no intercourse during the recent period of purity (tuhr), then even one menstrual period (‘iddah) is not necessary. However, this detail is specific to Uthman (radi Allahu anhu) himself. What is authentically established from the Prophet (sallallahu alayhi wa sallam) is that he commanded every woman who obtained khul‘ to observe an ‘iddah of one menstrual period (except for a pregnant woman), whether or not intercourse had taken place during the recent period of purity. He did not seek this detail. Furthermore, since intercourse is a hidden matter, the correct position is that every woman who obtains khul‘ should observe an ‘iddah of one menstrual period so that there remains no doubt or uncertainty.

(2) It should be remembered that in khul‘, there is no possibility of return (ruju‘), but a new marriage can take place afterwards, because this is in the ruling of three divorces.