The Book of Faith (Kitab Al-Iman)
Muslim :: Book 1 : Hadith 162
It is narrated on the authority of 'Abdullah b. Amr b. al-'As that the Messenger of Allah (may peace be upon him) 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.
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