Is it lawful for a husband to revoke Khul`?

Q 2: He divorced his second wife by means of Khul` (divorce at the request of the wife in return for compensation to the husband) in return for three thousand Riyals which he received immediately in the same session of divorce. Is it permissible for him to revoke this divorce? Attached is the document of Khul` signed by the witnesses.

Having discussed the query and the two documents, the committee replies as follows: Where the enclosed document signed by two witnesses states that Khul` has been made between you and your wife in return for three thousand Riyals which you received immediately in the same session of agreement, Khul` is effective. Accordingly, you can not revoke the divorce except by concluding a new marriage contract with her consent and conditions. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions.