When a Muslim army invaded a town, they would not allow anyone to convert to Islam for three days. During these three days they could kill as many men as they liked, pillage their properties, then rape and enslave their women and children. Only after a town had been decimated and all the young women and children that could be sold as slaves were captured would the brutal campaign of Islamization, with its brutal mandate that all must convert or die, began. However the Jews and the Christians were given protection to live provided they pay a penalty tax called Jizyah and enter into dhimmitude. Dhimmi means protected. But the dhimmis had to pay a hefty jizyah for their protection. This Jizyah was the source of livelihood of the Muslims who through it were able to live like parasites off the labor of the dhimmis. The following Hadith, reported by Bukhari, records the source for this practice based on the admonitions of Muhammad toward the dhimmi:
Narrated Juwairiya bin Qudama At-Tamimi:
We said to 'Umar bin Al-Khattab, oh Chief of the believers! Advise us." He said, "I advise you to fulfill Allah's Convention (made with the Dhimmis) as it is the convention of your Prophet and the source of the livelihood of your dependents (i.e. the taxes from the Dhimmis.) " Volume 4, Book 53, Number 388: