A Condition in the Marriage Contract
Question :

Can a woman put it as a condition in her marriage contract that the husband cannot marry a second woman without her permission? If she puts such a condition and the man accepts it is the condition valid or not?

Answer :

Yes, she is permitted to put such a condition in the marriage contract and the husband is obligated to fulfill it. If he violates this condition the second marriage is invalid unless the first wife permits it afterwards.