Taking an oath of divorce that one's wife will not study or teach and then changing his mind

Q: I have taken an oath that my wife shall not study or teach. I have intended to divorce her if she engages in studying or teaching. Now, I have changed my mind. What should I do to allow her (Part No. 20; Page No. 130) to study or teach? Please give us your Fatwa (legal opinion issued by a qualified Muslim scholar). May Allah reward and safeguard you.

A: If you have taken an oath of Talaq (divorce pronounced by a husband), by telling your wife for example, "By Allah, you will be divorced if you study or teach," and she has indeed engaged in studying or teaching, a single pronouncement of Talaq has taken effect. You have the right to revoke the Talaq during the `Iddah (woman's prescribed waiting period after divorce), unless it is the third time of Talaq. If the `Iddah has already expired, you have the right to remarry her with a new marriage contract and Mahr (mandatory gift to a bride from her groom), unless it is the third time of Talaq. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.