Hawzah News Agency – The merciful prophet of Islam (pbuh) says:

يُقالُ لِلعاقِّ: اِعمَلْ ما شِئتَ فإنّي لا أغفِرُ لَكَ .

'It will be said [by Allah] to the insolent [towards his parents]: Do what you want, for I will not forgive you.'

Source: Bihar al-Anwar, v. 74, p. 80, no. 82