The ruling on the marriage contract after the end of the waiting period, with an explicit proposal before it

Question:
He says: Honorable Shaykh, may Allah grant you success, if a man proposes to a woman during her waiting period explicitly, and then the marriage contract is made after the waiting period ends, is this contract valid?

Answer:
The contract is valid, but he commits a sin by doing so; because he has done something forbidden. However, if the contract was made after the waiting period ended, and the explicit proposal was made before the waiting period ended, this is a forbidden act. He must repent to Allah (Mighty and Majestic), and (Exalted and Majestic is He) says: And this is what was contracted only after the term ended, which is the waiting period. So the contract is valid, despite the sin.