Riyad as-Salihin, Book 1, Hadith 338 (In-Book) ⓘ

'Abdullah bin 'Amr bin Al-'as (May Allah be pleased with them) reported: Messenger of Allah 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 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 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 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."

وعنه أن رسول الله صلى الله عليه وسلم قال‏:‏ ‏"‏من الكبائر شتم الرجل والديه‏!‏‏"‏ قالوا‏:‏ يا رسول الله وهل يشتم الرجل والديه‏؟‏ ‏!‏ قال‏:‏ ‏"‏نعم؛ يسب أبا الرجل، فيسب أباه، ويسب أمه، فيسب أمه‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏ ‏.‏ وفي رواية ‏"‏إن من أكبر الكبائر أن يلعن الرجل والديه‏!‏‏"‏ قيل ‏:‏ يا رسول الله كيف يلعن الرجل والديه‏؟‏ ‏!‏ قال‏ "‏يسب أبا الرجل ، فيسب أباه، ويسب أمه، فيسب أمه‏"‏‏.‏