Kafir
A kafir, pronounced as, "kaafir", is someone who does not believe in God according to Islam. It is the most common description used in the Qur'an for non-believers or non-Muslims. They are also mentioned especially in the Quran in the Sura (chapter) Kafirun. Jews and Christians were required to pay the jizya while others, depending on the different rulings of the four Madhhabs, might be required to accept Islam, pay the jizya, be exiled, or be killed.