Does the husband have the right to revoke the document relinquishing one-third of the marital home to his first wife in court without her knowledge, after he has had children from a second wife, especially given that the document was made to circumvent the condition of her consent to his second marriage in Iraqi law?

If the wife has taken possession of her share of the house, it is considered a gift that cannot be revoked, based on the hadith (definition): "Do not go back on your charity." However, before possession and taking hold of it, he may revoke his gift, as ownership in a gift is not established by the contract before possession.