The Three Fundamental Principles

Muhammad ibn Abd al-Wahhab's "Three Fundamental Principles" (Thalathatul-Usool) teach that every Muslim must know: 1) Allah created us, sent Messengers, and we must obey; 2) Allah accepts no partners in worship (Tawhid); and 3) Whoever obeys the Messenger must not ally with those who oppose Allah, even if they're kin, all based on Quranic proofs, serving as answers to the questions asked in the grave.