Please clarify the ruling on back alimony owed to the wife who has been granted a divorce through khul`(divorce in return for reimbursement of the wife's dowry).
It is established in the Shari`ah (Islamic law) that back alimony is considered a debt owed by the husband to his wife; it is not eliminated except by paymentor exemption. If the wife officially waives alimony, she is not entitled to demand it at a later time. Otherwise, she is entitled to demand it because it is a debt owed by the husband as mentioned above.
The above answers the question and Allah Almighty knows best.