Al-Adab: Avoid Cursing own parents

Volume 008 :: Book 073 (Good Manners And Form (Al-Adab)) :: Hadith 004

Narated By 'Abdullah bin 'Amr :

Allah's Apostle said. "It is one of the greatest sins that a man should curse his parents." It was asked (by the people), "O Allah's Apostle! How does a man curse his parents?" The Prophet said, 'The man abuses the father of another man and the latter abuses the father of the former and abuses his mother."

Al-Adab: Be cautious from being decepted twice

Volume 008 :: Book 073 (Good Manners And Form (Al-Adab)) :: Hadith 154

Narated By Abu Huraira:

The Prophet said, "A believer is not stung twice (by something) out of one and the same hole."