The Jews commited treason against the Muslims in Medinah in the Battle of Ahzab (Confederates) [also known as Khandaq (Trench battle)], [the Jews planned on fighting the Muslims behind their back] - when the Muslims found out, they killed their men and enslaved their women and children.
According to the Old Testament [which the Jews believe is the unaltered revelation from God];
Deuteronomy 20:10-14 (Today's New International Version)So if this is the command God gives to the Jews in the Old Testament, then why are they saying that the Muslims are immorale, when it's part of their [Jewish] own law to do this!?
10 When you march up to attack a city, make its people an offer of peace. 11 If they accept and open their gates, all the people in it shall be subject to forced labor and shall work for you. 12 If they refuse to make peace and they engage you in battle, lay siege to that city. 13
When the LORD your God delivers it into your hand, put to the sword all the men in it. 14 As for the women, the children, the livestock and everything else in the city, you may take these as plunder for yourselves. And you may use the plunder the LORD your God gives you from your enemies.
Examples of Moses doing this in battle are mentioned in the Old Testament;
Numbers 31:7-18 (Today's New International Version)
7 They fought against Midian, as the LORD commanded Moses, and killed every man. 8 Among their victims were Evi, Rekem, Zur, Hur and Reba—the five kings of Midian. They also killed Balaam son of Beor with the sword. 9 The Israelites captured the Midianite women and children and took all the Midianite herds, flocks and goods as plunder. 10 They burned all the towns where the Midianites had settled, as well as all their camps.
15 "Have you allowed all the women to live?" he [Moses] asked them. 16 "They were the ones who followed Balaam's advice and enticed the Israelites to be unfaithful to the LORD in the Peor incident, so that a plague struck the LORD's people. 17 Now kill all the boys. And kill every woman who has slept with a man, 18 but save for yourselves every girl who has never slept with a man.
Further Reading;
http://www.islamic-life.com/forums/anti-islamic-refutations/execution-jews-bani-quraydah-663
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