Is it compulsory for the man to pay Mahr to validate the Nikah?

Answer

Mahr is Waajib. However, it is not a condition for the validity of the Nikah. But the husband must pay his wife a sum of money which they should mutually agree on. If he does not have cash, payment may be deferred to a later date. The Sunnat is Mahr-e-Faatimi which is 1.75 kg silver or its price. A lesser amount is also permissible.