Q: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Sentence: 'Quran is book to follow in Islam and its practical examples can be found in Prophets Life and that is written in books of Sunnah .', Argument/Subject 1: 'quran', Argument/Subject 2: 'islam'
A:
be book of