Anas (Radiyallaahu `anhu) reported Allah’s Apostle (Sallallaahu `alayhi wa sallam) about the major sins. He (the Holy Prophet) observed:
“Associating anyone with Allah, disobedience to parents, killing a person and false utterance.”

Narrated by Al Mughira (Radiyallaahu `anhu), The Prophet (Sallallaahu `alayhi wa sallam) said,
“Allah has forbidden you
(1) to be undutiful to your mothers
(2) to withhold (what you should give) or
(3) demand (what you do not deserve), and
(4) to bury your daughters alive.

‘Imran ibn Husayn (Radiyallahu `anhu) said, The Messenger of Allah (Sallallaahu `alayhi wa sallam) said,
“What do you say about fornication, drinking wine and theft?”

It is reported on the authority of ‘Abdullah that the Apostle of Allah (Sallallaahu `alayhi wa sallam) observed,
“The best of the deeds or deed is the (observance of) prayer at its proper time and kindness to the parents.”