Holy Prophet Muhammad al Mustafā (salla llāhu ʿalayhi wa-alehe wa-sallam) said:
to Amir al-Mu'minin Imām ‘Alī ibn Abī Tālib (alayhi salām)
“Jibrael (alayhi salām) has told Me such a wonderous thing that has made Me become immensely happy. He said, “O’Muhammad (salla llāhu ʿalayhi wa-alehe wa-sallam)! Allāh said to Me, “Give My salam to Muhammad (salla llāhu ʿalayhi wa-alehe wa-sallam) and tell Him that Ali (alayhi salām) is Imam of guidance, Misbahul Dajaa, and My Hujjah (proof) upon My creation. Verily, He is Siddiq e Akbar (most trustworthy) and Farooq e Azm (greatest honor). I swear by My honor, I will not put anyone in hell who loves Him and I will not allow anyone who denies His wilayat and does not obey Him to enter into jannah. I will fill hell with His enemies and jannah with His Shia.”
[Reference: Maya al Manqaba pg 20, Narrated by Abdullah bin Abbas]