Question:

Did At-Tusi classify the traditions of his two books – Tahdhib-ul-Ahkam and Al-Istibsar – as authentic (Sahih)?

Answer:

Abu Ja’far At-Tusi writes: “Whatever I narrate in the two books (At-Tahdhib and Al-Istibsar), I take from the principles that are considered authentic (Mu’tamad) and this is the path that many of the scholars of the tradition have taken.” [Kitab-ul-Wafi, Volume 1 Page 23]

قال أبو حعفر الطوسي: إن ما أورده في كتابي (التهذيب والاستبصار) الاخبار إنما آخذه من الاصول المعتمد عليها وقد سلك على ذلك المنوال كثير من علماء الرجال