O ye who believe! Fear Allah as He should be feared, and die not except in a state of Islam. (Surah Al-Imran-102)
This is an English translation of Ibn Rajab al Hanbali's classic work Jami'al Ulum Wal Hikam. It is basically a listing of 50 ahadith (sayings of the Prophet), and along with them are comments, lessons to be learned from them, and sayings of the Sahaba regarding them.