"Abd Allah b. "Amr (b. al-As) reported the Messenger of Allah (ﷺ) as saying:
A man's reviling of his parents is one of the grave sins. He was asked : Messenger of Allah! How does a man revile his parents? He replied: He reviles the father of a man who then reviles his father, and he reviles a man's mother and he reviles his.
Reference: Sunan Abi Dawud 5141 In-book : Book 43, Hadith 369 English translation : Book 42, Hadith 5122
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