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"I shall turn away from My Ayaat (verses of the Qur'aan) those who behave arrogantly on the earth, without a right, and (even) if they see all the Ayaat (proofs, evidences, verses, lessons, signs, revelations, etc.), they will not believe in them, And if they see the way of righteousness (monotheism, piety, and good deeds), they will not adopt it as the Way, but if they see the way of error (polytheism, crimes and evil deeds), they will adopt that way, that is because they have rejected Our Ayaat (proofs, evidences, verses, lessons, signs, revelations, etc.) and were heedless (to learn a lesson) from them." [Al-A'raaf (7):146]

Narrated Al-Ahnaf bin Qais:

While I was going to help this man ('Ali Ibn Abi Talib), Abu Bakra met me and asked, "Where are you going?" I replied, "I am going to help that person." He said, "Go back for I have heard Allah's Apostle saying, 'When two Muslims fight (meet) each other with their swords, both the murderer as well as the murdered will go to the Hell-fire.' I said, 'O Allah's Apostle! It is all right for the murderer but what about the murdered one?' Allah's Apostle replied, "He surely had the intention to kill his companion." [The Book of Faith Volume 1, Book 2, Hadeeth 30]