“Consent of first wife for second marriage.
In our beloved country (Pakistan), it is necessary to obtain permission from the first wife before a second marriage. This is a temporal, local, and penal law for the protection of women’s rights. Its purpose is to close the doors of injustice and baseless complaints. In view of the circumstances and urgent needs, the current government is allowed to make some ijtihadi decisions. Registration of marriage in the constitution of our beloved country is also one of these provisions, which no school of thought objects to.”
Hurmat e Niswaan by Muhammad Ehsaan ul haq Hashmi page 74, the book is praise by kibaar scholars including Shaykh Irshad ul haq Atharee see page 11 of the book.