If you avoid the major (part) of what you have been forbidden
(to do), We will cancel out for you your (other) evil deeds and
will admit you (to Paradise) with a noble entry. (al-Nisa 4:31)
Thus by this verse, Allah Most High has guaranteed the Garden
of Paradise to those who avoid the major sins. And Allah Most
High also says:
Those who avoid the greatest of sins and indecencies, and forgive
when they are angry (al-Shra 42:37) Those who avoid the greatest
sins and indecencies, except for oversights, (will find that)
surely your Lord is ample in forgiveness. (Al-Najm 53:32)
The Messenger of Allah (SAW) said: "The five [daily] prayers,
Friday to Friday, and Ramadan to Ramadan make atonement for what
has happened since the previous one when major sins have been
avoided." It is therefore very important to determine exactly
what the greatest vices, technically called "the major sins"
(Kaba'ir), are, in order that Muslims should avoid them.
There is some difference of opinion among scholars in this regard.
Some say these major sins are seven, and in support of their position
they quote the tradition: "Avoid the seven noxious things"-
and after having said this, the propeht (SAW) mentioned them:
"associating anything with Allah; magic; killing one whom
Allah has declared inviolate without a just case, consuming the
property of an orphan, devouring usury, turning back when the
army advances, and slandering chaste women who are believers but
indiscreet." (Bukhari and Muslim)
'Abdullah ibn 'Abbas said: "Seventy is closer to their number
than seven," and indeed that is correct. The above tradition
does not limit the major sins to those mentioned in it. Rather,
it points to the type of sins which fall into the category of
"major." These include those crimes which call for a
prescribed punishment (HADD; plural, HUDUD), such as theft, fornication
or adultery (ZINA), and murder; those prohibited acts for which
a warning of a severe punishment in the Next is given in the Qur'an
or the tradition; and also those deeds which are cursed by our
Prophet (SAW). These are all major sins.
Of course, there is a gradation among them, since some are more
serious than others. We see that the Prophet (SAW) has included
SHIRK (associating someone or something with Allah) among them,
and from the text of the Qur'an we know that a person who commits
SHIRK will not his sin be forgiven and will remain in Hell forever.
Allah Most High says:
Surely, Allah does not forgive associating anything with Him,
and He forgives whatever is other than that to whomever He wills.
(al-Nisa 4:48 and 116)