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The Lord of the worlds revealed the book - Quran - for the guidance of mankind.
In the book, general Islamic basic principles are available but much more details have not been mentioned directly but, the lord explained that details to Prophet Mohammad (PBUH,) and then he wanted Ali (PBUH) to write them completely.
In this artilce, it is proved that Holy Quran, without those details cannot be used perfectly for all.
Quran is comprehensible exactly when we use that details and remarks - that‘s called hadith correctly