A review by obviouslyyuta
الأربعون النووية by يحيى بن شرف النووي

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nr 14 was so inspiring for me especially the third part like the cult aspect really hits home and made me feel closer to god than ever :
 

َعنِ ابْنِ مَسْعُودٍ رضي الله عنه قَالَ: قَالَ رَسُولُ اللهِ : (لا يَحِلُّ دَمُ امْرِئٍ مُسْلِمٍ إِلاَّ بإِحْدَى ثَلاثٍ: الثَّيِّبُ الزَّانِيْ، وَالنَّفْسُ بِالنَّفْسِ، وَالتَّاركُ لِدِيْنِهِ المُفَارِقُ للجمَاعَةِ) رواه البخاري ومسلم. 

eng :

On the authority of Abdullah Ibn Masud (may Allah be pleased with him) who said: The Messenger of Allah (peace be upon him) said:

"It is not permissible to spill the blood of a Muslim except in three [instances]: the married person who commits adultery, a life for a life, and the one who forsakes his religion and separates from the community."

[Al-Bukhari & Muslim] 
"