Hadith 31-9

[8] This means that Ali (a.s.) will be the one to let people enter Heaven or Hell. This is also supported in several other traditions. Once when Imam As-Sadiq (a.s.) was asked about this he said, “Since the love for Ali (a.s.) equals faith, and despise for him equals atheism, and Paradise is for the faithful ones and Hell is for the atheists, then that is why Ali (a.s.) is said to be the one who will allocate Heaven and Hell.” A similar tradition has also been narrated from Imam Ar-Ridha’ (a.s.) in response to a question from Al-Ma’mun.