What are the proofs from the Quran, Sunnah, and sayings of scholars that politics is an integral part of religion?

Politics, with its governance system, management of state affairs, and international relations, is an essential part of religion, because the right to legislate and rule belongs to Allah alone. This principle is a matter of monotheism and faith, not a subsidiary issue. Many Quranic verses confirm that judgment and legislation belong to Allah Almighty.