"Fight those who believe not in Allah or 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, until they pay the jizya with willing submission, and feel themselves subdued." - Quran 9:29 (read more)

"Narrated Kurib: the freed slave of Ibn 'Abbas, that Maimuna bint Al-Harith told him that she manumitted a slave-girl without taking the permission of the Prophet. On the day when it was her turn to be with the Prophet, she said, "Do you know, O Allah's Apostle, that I have manumitted my slave-girl?" He said, "Have you really?" She replied in the affirmative. He said, "You would have got more reward if you had given her (i.e. the slave-girl) to one of your maternal uncles." - Sahih Bukhari 3:47:765 (read more)

"...the Messenger of Allah (may Allah bless him and grant him peace) used to go out on military expeditions or send out an army at least every two months. The virtuous Companions continued upon the path of the Noble Prophet (may Allah bless him and grant him peace), for the Glorious Qur'an had brought up this generation with an education of Jihad. They had been bathed in Jihad and cleansed of engrossment in worldly matters, just as a wound is bathed in water." - Imam Abdullah Azzam