The QURAN
“And it is not conceivable that a believer should slay another believer unless it be by mistake……………………. But whoever deliberately slays another believer, his requital shall be hell, therein to abide; and God will condemn him, and will reject him, and will prepare for him awesome suffering.”
[Quran – 4:92-93]

“Because of this did We ordain unto the children of Israel that if anyone slays a human being-unless it be [in punishment] for murder or for spreading corruption on earth-it shall be as though he had slain all mankind; whereas, if anyone saves a life, it shall be as though he had saved the lives of all mankind.”
[Quran – 5:32]

Babylonian TALMUD
“FOR THIS REASON WAS MAN CREATED ALONE, TO TEACH THEE THAT WHOSOEVER DESTROYS A SINGLE SOUL OF ISRAEL,39 SCRIPTURE IMPUTES [GUILT] TO HIM AS THOUGH HE HAD DESTROYED A COMPLETE WORLD; AND WHOSOEVER PRESERVES A SINGLE SOUL OF ISRAEL, SCRIPTURE ASCRIBES [MERIT] TO HIM AS THOUGH HE HAD PRESERVED A COMPLETE WORLD”
[Tractate Sanhedrin Folio 37a, 39-40]

Prophet of Islam (Peace Be Upon Him) has said: [Muslim, Book #020, Hadith #4555] “Whoso attacks my Umma (indiscriminately) killing the righteous and the wicked of them, sparing not (even) those staunch in faith and fulfilling not his promise made with those who have been given a pledge of security-he has nothing to do with me and I have nothing to do with him.”

[Bukhari, Book #58, Hadith #233] “Narrated ‘Ubada bin As Samit: I was one of the Naqibs who gave the (‘Aqaba) Pledge of Allegiance to Allah’s Apostle. We gave the pledge of allegiance to him that we would not worship anything other than Allah, would not steal, would not commit illegal sexual intercourse, would not kill a person whose killing Allah has made illegal except rightfully, would not rob each other, and we would not be promised Paradise if we did the above sins, then if we committed one of the above sins, Allah will give His Judgment concerning it.”

[Muslim, Book #017, Hadith #4238] “Ubida b. as-Samit reported: I was one of those headmen who swore allegiance to Allah’s Messenger (may peace be upon him) that we will not associate anything with Allah, and will not commit adultery, and will not steal, and will not kill any soul which Allah has forbidden, but with justice nor plunder, nor disobey (Allah and His Apostle), then Paradise (will be the reward) in case we do these (acts); and if we commit any outrage (and that goes unpunished in the world), it is Allah Who would decide about it. Ibn Rumh said: Its judgment lies with Allah.”

[Sunan Abu Dawud, Book #14, Hadith #2526] “Narrated Anas ibn Malik: The Prophet (peace be upon him) said: Three things are the roots of faith: to refrain from (killing) a person who utters, “There is no god but Allah” and not to declare him unbeliever whatever sin he commits, and not to excommunicate him from Islam for his any action, and jihad will be performed continuously since the day Allah sent me as a prophet until the day the last member of my community will fight with the Dajjal (Antichrist). The tyranny of any tyrant and the justice of any just (ruler) will not invalidate it. One must have faith in Divine decree.”