Killing a Believer:-                

4:92 Never should a believer kill a believer; but (if it so happens) by mistake
(compensation is due): if one (so) kills a believer it is ordained that he should free a believing slave and pay compensation to the deceased's family unless they remit it freely.  If the deceased belonged to a people at war with you and he was a believer the freeing of a believing slave (is enough).  If he belonged to a people with whom ye have a treaty of mutual alliance compensation should be paid to his family and a believing slave be freed.  For those who find this beyond their means (is prescribed) a fast for two months running: by way of repentance to Allah: for Allah hath all knowledge and all wisdom.

4: 93        If a man (a believer) kills a (another) believer intentionally his recompense is Hell to abide therein (for ever): and the wrath and the curse of Allah are upon him and a dreadful penalty is prepared for him.

       *** The 'Islamic Brotherhood' is the figment of imagination of the Quran and its interpreters.

       From the moment Muhammad died until this day, Muhammmadan Muslims have been killing and or murdering other 'Muslims' with exactly the same relish felt against the Kuffar (Unbelievers).

       The calamities that have befallen Muhammadans Muslims, must therefore be attributed to their own backsliding and perverting of the Quran; this is the same logic that the Quran sees fit to attack the Jews and Christians with ***

Sahih Al-Bukhari HadithHadith 1.46        Narrated byAbdullah
The Prophet said, "Abusing a Muslim is Fusuq (an evil doing) and killing him is Kufr (disbelief)." Narrated 'Ubada bin As-Samit: "Allah's Apostle went out to inform the people about the (date of the) night of decree (Al-Qadr) but there happened a quarrel between two Muslim men. The Prophet said, "I came out to inform you about (the date of) the night of Al-Qadr, but as so and so and so and so quarreled, its knowledge was taken away (I forgot it) and maybe it was better for you. Now look for it in the 7th, the 9th and the 5th (of the last 10 nights of the month of Ramadan)." 

       *** The 'greatest of all prophets' could not remember the recent past relating to the most momentous event in his life ***

Sahih Al-Bukhari HadithHadith 6.114        Narrated bySaid bin Jubair
The people of Kufa disagreed (disputed) about the above Verse. So I went to Ibn Abbas and asked him about it. He said, "This Verse:  'And whoever kills a believer intentionally, his recompense is Hell,' was revealed last of all (concerning premeditated murder) and nothing abrogated it."

Sahih Al-Bukhari HadithHadith 6.285        Narrated byAl Qasim bin Abi Bazza
That he asked Said bin Jubair, "Is there any repentance of the one who has murdered a believer intentionally?" Then I recited to him: 
"Nor kill such life as Allah has forbidden except for a just cause." Said said, "I recited this very Verse before Ibn 'Abbas as you have recited it before me. Ibn 'Abbas said, 'This Verse was revealed in Mecca and it has been abrogated by a Verse in Surat-An-Nisa which was later revealed in Medina.' "

Sahih Al-Bukhari HadithHadith 9.10        Narrated byAnas bin Malik
The Prophet said, "The biggest of Al-Kaba'ir (the great sins) are (1) to join others as partners in worship with Allah, (2) to murder a human being, (3) to be undutiful to one's parents (4) and to make a false statement," or said, "to give a false witness."

Sahih Al-Bukhari HadithHadith 9.17        Narrated byAbdullah
Allah's Apostle said, "The blood of a Muslim who confesses that none has the right to be worshipped but Allah and that I am His Apostle, cannot be shed except in three cases: In Qisas for murder, a married person who commits illegal sexual intercourse and the one who reverts from Islam (apostate) and leaves the Muslims."