Did Muslims behead males of Banu Qurayza?

Question

I read somewhere that Muslims beheaded 400-900 males of Banu Qurayza after they were defeated in war.

• Is there any reliable reference supporting this claim?

Update: This incident is allegedly exaggerated or invented, according to the following sources:

• Meri, Medieval Islamic Civilization: An Encyclopedia, p. 754.
• Arafat, "New Light on the Story of Banu Qurayza and the Jews of Medina", p. 100-107. Arafat relates the testimony of Ibn Hajar, who denounced this and other accounts as "odd tales" and quoted Malik ibn Anas, a contemporary of Ibn Ishaq, whom he rejected as a "liar", an "impostor" and for seeking out the Jewish descendants for gathering information about Muhammad's campaign with their forefathers.
• Nemoy, "Barakat Ahmad's "Muhammad and the Jews"", p. 325. Nemoy is sourcing Ahmad's Muhammad and the Jews.

Answer 1

The beheading of men is reported in the History of at-Tabari, volume 8, under the section "The Events of the Year 5," page 35:

"...Allah's Messenger went out into the market place of Medina and had trenches dug in it; then he sent for them and had them beheaded in those trenches. they were brought out to him in groups..."

It's also mention in Tafsir ibn Kathir, under the explanation of Surah al-Ahzab verse 26, under the section "The Campaign against Banu Qurayzah":

the Messenger of Allah commanded that ditches should be dug, so they were dug in the earth, and they were brought tied by their shoulders, and were beheaded. There were between seven hundred and eight hundred of them. The children who had not yet reached adolescence and the women were taken prisoner, and their wealth was seized.

Answer 2

Banu Quraiyza had a treaty with the Muslims during the war with the Meccan tribes. They broke this treaty. After a siege, they surrendered and the Prophet (PBUH) asked them who they wanted to determine their punishment. The one that they chose said that the fighters should be executed and the rest enslaved, widely believed to be based on Deuteronomy 20:12-14* since he said that his decision was based on Jewish law (perhaps since Banu Quraiyza was a Jewish tribe). So many of the men who fought were indeed killed. This punishment excludes some, such as those who broke away from the Quraiyza and seeked protection from the Muslims.

As for the enslavement, there are many rules protecting slaves in Islam ("master" responsible for providing, can't separate certain family members, can't be abused, etc.) but that's another topic altogether. It must be taken into account that after the men were killed, very vulnerable tribe filled only with women and children was left, and that is a dangerous situation to be left in.

*"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."

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See the following link:

http://seekershub.org/a-balanced-explanation-of-the-banu-qurayza-controversy