Qur'an (9:29) - "Fight those who believe not in Allah nor the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the People of the Book (the Jews and the Christians), until they pay the Jizya with willing submission, and feel themselves subdued."
From the Hadith:
Muslim (19:4294) - There are many places in the hadith where Muhammad tells his followers to demand the jizya of non-believers. Here he lays down the rule that it is to be extorted by force: "If they refuse to accept Islam, demand from them the Jizya. If they agree to pay, accept it from them and hold off your hands. If they refuse to pay the tax, seek Allah's help and fight them"