There is a link that full with these kind of quotations. Baqir Majlisi declared in Biharul Anwar, Volume 23 Page 290 (Published in Beirut): "Note that the terms shirk (polytheism) and kufr (disbelief) apply to one who does not believe in the Imamah of Ali (as) or his progeny, and gives precedence to others over them, proving that they are kuffar destined to reside in hell." Allama Abdullah al Mamqani wrote in Tanqihul Maqal