(38) باب بَيَانِ الْكَبَائِرِ وَأَكْبَرِهَا
It is narrated on the authority of 'Abdullah b. Amr b. al-'As that the Messenger of Allah (ﷺ) observed:
Abusing one's parents is one of the major sins. They (the hearers) said: Messenger of Allah, does a man abuse his parents too? He (the Holy Prophet) replied: Yes, one abuses the father of another man, who in turn abuses his father. One abuses his mother and he in turn abuses his (the former's) mother.
Reference: Sahih Muslim 90 a
In-book reference: Book 1, Hadith 169
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 162