و عن أبي بكرة نفيع بن الحارث رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏"‏ألا أنبئكم بأكبر الكبائر‏؟‏‏"‏ ثلاثًا قلنا‏:‏ بلى يا رسول الله‏:‏ قال‏:‏ ‏"‏الإشراك بالله، وعقوق الوالدين" وكان متكئاً فجلس، فقال: "ألا و قول الزور و شهادة الزور" فما زال يكررها حتى قلنا: ليته سكتز‏ ‏(‏‏(‏متفق عليه‏)‏‏)

'Abdullah bin 'Amr bin Al-'as (May Allah be pleased with them) reported

Messenger of Allah (ﷺ) said, "It is one of the gravest sins to abuse one's parents." It was asked (by the people): "O Messenger of Allah, can a man abuse his own parents?" Messenger of Allah (ﷺ) said, "He abuses the father of somebody who, in return, abuses the former's father; he then abuses the mother of somebody who, in return, abuses his mother".[Al-Bukhari and Muslim].Another narration is: Messenger of Allah (ﷺ) said, "One of the major sins is to curse one's parents". It was submitted: "O Messenger of Allah! How can a man curse his own parents?" He (ﷺ) said, "When someone curses the parents of another man who in return abuses the former's father; and when someone abuses the mother of another man who in return abuses his mother."