It is called Islamic Shari'a in Arabic
Quran is God revelation and His words to prophet Muhammad through the Angel Gabriel. Hadith is prophet Muhammad saying.
No it does not say in the quran or any hadith
The Quran and hadith
rephrase
Hadith
their main book is Quran. also Nahj al-Balaghe (collection of sayings of Imam Ali)- brother of Quran and Sahifeh Sajadieh (worships from Imam Sajad)- Sister of Quran also 4 main Hadith book that contains near 120,000 Hadith from the fourteen infallibles.
The holy Quran & the Hadith are the first main sources of legislations in Islam,respectively.
The Quran was revealed in Arabic to the Prophet (peace be upon him) who was also an Arab. The sayings and teachings of the Prophet (peace be upon him) which explain the Quran and taught the how to live their life by the Quran are called hadith and are also in arabic.
The Prophet Muhammad (Peace be upon him) was described by his noble wife, 'Aa'ishah (May Allah be pleased with her)as a "walking Quran": in other words, he didn't just read and recite the Quran, he lived it.
One should study hadith because of good guide line which did not cover in Quran.
It in the Qur'an and the hadith that the Five pillars of Islam mentioned and how to put them into practice.
Hadith Naboui is prophet Muhammad (peace be upon him) own sayings. Hadith Qodsi is sayings of God (not part of Quran) conveyed to prophet Muhammad to inform his people with.