Huzaifah narrates that the Messenger of Allah (ص) said:
The parable of Ali bin Abi Talib among people is the parable of “Say, He is Allah the One” in the Qur’an
Dailami, Firduas Al-Akhbar, V.4, page 422; Qunduzi, Yanabi al-Muwadda, V.2, page 239-240.