All guidance belongs to Ahlulbayt(عليهم السلام)

بسم الله الواحد القهار

Sheikh Al-Mufid:

Abul Qasim Ja'far Ibn Mohammad reported to me from his father, from Sa'd Ibn Abdullah, from Ahmad Ibn Mohammad Ibn Isa, from al-Hasan Ibn Mahboub, from Abu Ayyoub al-Khazzaz, from Muhammad Ibn Muslim, who reported that:
Abu Ja'far Mohammad Ibn Ali(عليه السلام) said: "People (who have discarded us) have no truth, nor any propriety, except that which they have learnt from us Ahlulbayt. None from them can judge truly or with justice, unless he has taken its guidance from Amirul Mu'minin Ali Ibn Abi Talib(عليه السلام), the key, the gate, the path blazer, the way. And when they are confused in any matter, the fault is theirs if they commit an error; and if they decide rightly, the credit goes to Ali Ibn Abi Talib (عليه السلام)."

Source: Amali Sheikh Al-Mufid, Pg. 95-96

Grading: Sahih(authetnic), its narrators are trustworthy.

Check the Rijaal section for the authenticity of the Chain:

369: Ja'far Ibn Mohammad Ibn Ja'far Ibn Musa Ibn Qulawaih
1599: Mohammad Ibn Ja'far Ibn Musa Ibn Qulawaih
809: Sa'd Ibn Abdullah Ibn Abi Khalaf
130: Ahmad Ibn Mohammad Ibn Isa Ibn Abdullah Al-Ash'ari Al-Qummi
516: Al-Hasan Ibn Mahboub Al-Sarraad

35: Ibraheem Ibn Isa, Abu Ayyoub Al-Khazzaz

1782: Mohammad Ibn Muslim Ibn Rabah Ath-Thaqafi