Ali had four rings which he used to wear – Sapphire for his nobility, and Turquoise for his victory, and the Chinese Iron for his strength, and Garnet for his protection. It was engraved on the Sapphire: ‘There is no god except for Allah, the King, the Evident Truth’; and it was engraved upon the Turquoise: 'Allah, the King, the Evident Truth’; and it was engraved upon the Chinese Iron: 'All Honor is for Allah’; and three lines were engraved upon the Garnet: 'Whatever Allah so Desires, There is no Strength except by Allah, I seek Forgiveness of Allah’.
Because love for Ali is faith, and hate for him is disbelief. But rather, the Paradise was created for the people of faith, and the Fire was created for the people of disbelief. Therefore, he is the distributor of the Paradise and the Fire due to this reason. So the Paradise, none shall enter it except the people who love him, and the Fire, none shall enter except for the people who hate him.
Imam Ja’far al-Sadiq (ع) Illal al-Sharaie v. 1, ch. 130
Al Mufazzal bin Umar (ر) asked Imam Ja’far al-Sadiq (ع), ‘Why did Amirul Mo’minin Ali ibn Abu Talib come to be Distributor of Paradise and the Fire?’ Imam al-Sadiq (ع) replied…