You can assume it is a Quranic reference since the scholar who told me this has read Quran and Hadees many times over and delivers lecture in entire Faislabad/Gujranwala area. He even speaks Arabic.
I don't want to assume as a Human being is prone to mistakes
Sir i'm just asking for the Specific Verse from the Holy Qur'an which suggests/orders this kind of Punishment, nothing more nothing less !!!!