The Worst Deed in the Eyes of Allah

Holy Prophet Muhammad al Mustafa(S.A.W.W) said:

"To attribute partners to Allah.”The man then asked, “After this which is the worst sin?”The Holy Prophet (s.a.w.s.) said:“To sever relations”.After this the same person asked, “After this which is the worst sin?”The Holy Prophet (s.a.w.s.) replied:“To enjoin the evil and to forbid the good (deeds)."

Al Kafi