Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated ‘Abdullah bin ‘Amr (Radi-Allahu ‘anhu):
Allah’s Apostle (Sallallahu ‘Alaihi Wa Sallam) said. “It is one of the greatest sins that a man should curse his parents.” It was asked (by the people), “O Allah’s Apostle! How does a man curse his parents?” The Prophet (Sallallahu ‘Alaihi Wa Sallam) said, “’The man abuses the father of another man and he (the latter) abuses the father of the former and abuses his mother.”
Bukhari Vol. 8 : No. 4