From Usool uth Thalaathah:
With the proofs.7
Sh Fawzaan hafizahullaah explained:
His saying, “With the proofs”: not due to taqleed (blind following), but rather with the proofs from the Qur’aan and from the Sunnah – this is knowledge.
Ibn ul-Qayyim said in Al-Kaafiyat-ush-Shaafiyah:
Knowledge is Allaah said, His Prophet said,
The Companions said – they are the possessors of knowledge and awareness
Knowledge is not that you foolishly raise up a disagreement
Between the Messenger and the opinion of so-and-so.
This is what is knowledge, knowledge is the knowledge contained in the Book and the Sunnah. As for the sayings of the ’ulemaa (the scholars), then they only explain and clarify the speech of Allaah and the speech of the Messenger sallallaahu’alaihiwasallam, and some of them may contain a mistake, and the proofs are not the speech of the ’ulemaa, rather the proofs are the aayahs of the Qur’aan and the Prophetic ahadeeth. As for the speech of scholars, then it explains and clarifies that, except it is not a proof in itself.
(Translated by Abu Talhah rahimahullaah)