“Observe the trait(s) which elevated the status of Ali ibn Abi Talib (as) to that nearest to the Prophet Muhammad (pbuh&hp), and strengthen those traits within you. Be certain that the status of Ali ibn Abi Talib was attained by none other than his truthfulness and trustworthiness.”
Ja’far al-Sadiq(as)
Reference: Al-Kafi vol. 2 – pg. 104