SAHIH BUKHARI

Volume 1, Book 2, Number 8:

Narrated Abu Huraira:

The Prophet said, "Faith (Belief) consists of more than sixty branches (i.e. parts). And Haya (This term "Haya" covers a large number of concepts which are to be taken together; amongst them are self respect, modesty, bashfulness, and scruple, etc.) is a part of faith."