Kulaini has narrated from Abu Saba through reliable chains...
Kulaini has narrated from Abu Saba through reliable chains of narrators that Imam Baqir (a.s.) told him: Help me through piety. Whoever from you meets Allah with piety, for him there will be salvation and opening near Allah, because Allah says: And whoever obeys Allah and the Apostle… The Apostle is from us; from us are the truthful, martyrs, pious and it is incumbent upon Allah that He gathers our Shias and friends with the prophets, the truthfuls, the martyrs and the pious.
There is a tradition in Khisal that the Prophet (S) said that there are three truthful ones: Ali Ibne Abi Talib, Habib Najjar and the believer of the people of Firon. In Uyoon Akhbar Ridha it is narrated from the Hazrat that the Holy Prophet (S) said that in every Ummah there is one ‘truthful’ (Siddiq) and one ‘discriminator’ (Farooq) and the ‘truthful’ and the ‘discriminator’ of this Ummah is Ali Ibne Abi Talib (a.s.).
Ali Ibne Ibrahim has narrated that ‘prophets’ means the Holy Prophet (S), ‘truthful’, Ali Ibne Abi Talib (a.s.), ‘martyrs’, Hasan and Husain (a.s.) and ‘good’ are the other holy Imams (a.s.). *…and a goodly company are they…*is the Qaem Aale Muhammad (Imam Mahdi). Ibne Mahyar has narrated from Abu Ayyub Ansari that ‘truthful’ (Siddiq) are three: Hizqeel, the believer of the people of Firon, Habib Najjar, the person of Yasin and Ali Ibne Abi Talib (a.s.), and he is the best of all.
It is narrated from Imam Sadiq (a.s.) that once an angel having twenty heads came to the Holy Prophet (S). The Prophet wanted to kiss his hand but he stopped him and said that you are the most respected one near Allah among all the creatures of this world and of the heavens. The name of that angel was Mahmud.
When the angel turned, the Prophet saw that it was written between his shoulders: There is no god but Allah, Muhammad is the messenger of Allah and Ali is the greatest truthful (Siddiq-e-Akbar). The Prophet asked him: My friend, since when is this written between your shoulders. He replied: Ten thousand years before Allah created Adam.