Would you please show me where these things are commanded in the Holy Quran?
Your challenge is false, because I can evidence the Hadith, which you personally don’t believe are authentic
per se whereas most Moslems do. So I’ll deal with this false set-up first.
Muslims regard Muhammad the best example of man.
Muslims believe that Muhammad is the ideal man - an example for all time (hence that is why Allah chose him - because he was a cut above the rest)
“The Lord of the universe, The Most Merciful and Compassionate sent about 124,000 prophets and messengers to every nook and corner of this earth to guide humanity towards understanding the purpose of its creation and thereby surrender to His Divine Laws and achieve its final destiny of Eternal Peace in His Paradise. The last messenger of God who brought His last revelation the Holy Quraan to humanity is Muhammad bin 'Abdullah, born in Mekkah, approximately 550 years after Jesus, son of Mary, peace and blessings of God be on them both. This is the account of this last Messenger of God, the most remarkable man, that human history has known.”
daar-ul-ehsaan.org/truth/must.htm
“The Prophet accomplished all this through the strength of his character and personal example;”
4newmuslims.org/prophet.htm
The Haddiths though not perfect, are second to the Koran for sources of instruction for Muslims
Some might say that the Haddiths are not perfect, but that’s only when compared with the Koran… “The point is not that Hadith is an unreliable source of information. On the contrary, Hadith lacks the level of reliability which is entailed in the basic sources of the Shari`ah. In other words, it is only when compared to the Qur’an and the Sunnah that Hadith seems wanting in reliability. Nevertheless, if one were to compare Hadith with, for instance, sources of other histories, it would easily surpass the reliability of the sources of other histories on all accounts. This is only due to the strenuous work done by the scholars of Hadith in this field of study.”
understanding-islam.org/related/text.asp?type=question&qid=319&sscatid=69
As to the PoWs, this is a specific incident. First there’s however there’s a general Koranic calling for people to be killed
47.4 So, when you meet (in fight Jihad in Allah’s Cause), those who disbelieve smite at their necks till when you have killed and wounded many of them, then bind a bond firmly (on them, i.e. take them as captives). Thereafter (is the time) either for generosity (i.e. free them without ransom), or ransom (according to what benefits Islam), until the war lays down its burden. Thus [you are ordered by Allah to continue in carrying out Jihad against the disbelievers till they embrace Islam (i.e. are saved from the punishment in the Hell-fire) or at least come under your protection], but if it had been Allah’s Will, He Himself could certainly have punished them (without you). But (He lets you fight), in order to test you, some with others. But those who are killed in the Way of Allah, He will never let their deeds be lost,
Then, there’s a Sura that deals specifically with this massacre of PoWs
“And He has caused to descend from their strongholds the Jews that assisted them. And he struck terror into their hearts. Some you slaughtered and some you took prisoner”
Sura 33.25
Then there’s the Hadith that deals specifically with this massacre too.
“Bani An-Nadir and Bani Quraiza fought, so the Prophet (Muhammad) exiled Bani An-Nadir and allowed Bani Quraiza to remain at their places. He then killed their men and distributed their women, children and property among the Muslims, but some of them came to the Prophet and he granted them safety, and they embraced Islam. He exiled all the Jews from Medina. They were the Jews of Bani Qainuqa’, the tribe of 'Abdullah bin Salam and the Jews of Bani Haritha and all the other Jews of Medina.”
(Hadith, Sahih Bukhari 5:59:362)
usc.edu/dept/MSA/fundamentals/hadithsunnah/bukhari/059.sbt.html#005.059.362