Hadith on Parents: Do not curse your own parents

 عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنَّ مِنْ أَكْبَرِ الْكَبَائِرِ أَنْ يَلْعَنَ الرَّجُلُ وَالِدَيْهِ قِيلَ يَا رَسُولَ اللَّهِ وَكَيْفَ يَلْعَنُ الرَّجُلُ وَالِدَيْهِ قَالَ يَسُبُّ الرَّجُلُ أَبَا الرَّجُلِ فَيَسُبُّ أَبَاهُ وَيَسُبُّ أُمَّهُ

Meaning: Abdullah ibn Amr ( Rali ) reported: The Messenger of Allah, peace, and blessings be upon him, said, “Verily, one of the major sins is that a man curses his parents.” It was said, “O Messenger of Allah, how can a man curse his parents?” The Prophet said, “He insults the father of another man and then that man insults his father and his mother.”

• Source: Ṣaḥīḥ al-Bukhārī 5628, 
• Ṣaḥīḥ Muslim 90
• Muttafaqun Alayhi

 (authenticity agreed upon) according to Al-Bukhari and Muslim