3 things prevent the deeds from being accepted

بـسـم الله والحـمـد لله والـصلاة والـسـلام عــلى رسـول الله، وبـعـد

Bilaal bin Sa`d رحمه الله said:

"Righteous deeds are not accepted along with (these) three things:

1. Shirk (major and minor).
2. Kufr,
3. Opinion."

He was asked: "what is 'opinion'"?

He said: "Ignoring the Book of Allaah and the Sunnah of His Messenger صلى الله عليه وسلم and acting upon ones own opinion."

[al-Hilyah (5/229)]