Regarding hadith,it seems there are some that are deemed "reliable" and "Unreliable",which hadith are binding ? Please be specific.

A Hadith can be categorized with regards to its authenticity into basically 4 types, 1) Sahih (authentic), 2) Hasan (sound), 3) Dha'eef (weak), 3.1) Dha 'eef Jiddan (very weak), and 4) Mawdhoo (fabricated)

The first 2 types can be used as proofs for the different laws in Shari'ah. The third can be used (with a few conditions attached) to establish virtues for any specific deed or person. (This is accepted by the vast majority of the Muhadditheen).

3.1 and 4 cannot be used for anything besides for the purpose of explaining to somebody it's classification. They cannot be quoted in any lecture, book, etc. with the intention of inspiring people through its contents. Rasulullah (Sallallaahu Alayhi Wasallam) said, 'He who lies (about a speech) of mine should prepare his abode in the fire.' (Bukhari)

Hence, the Ulama have deduced that it is Haraam (forbidden) for one to quote any fabricated Hadith without explicitly mentioning its fabrication. As for 3.1 (very weak, which is also referred to by the words, 'very unreliable'), because of it being so weak, the Ulama have joined it to Mawdhoo (fabricated) Ahaadith. So, they share the same law as mentioned above. (For further reference, see Sharh Nukhbatul Firk of Haafiz ibn Hajar; Tadreeburraawiy of Haafiz Suyyooti and; Al-Ajwibatul fadhilah of Ml. Abdul Hayy Laknawiy)

and Allah Ta'ala Knows Best

Moulana Muhammad ibn Moulana Haroon Abbassommar
FACULTY OF SPECIALTY IN HADITH

CHECKED AND APPROVED: Mufti Ebrahim Desai