Killing

The eradication of the whole world is more insignificant for Allah than the blood that has been shed without right.

رسولُ اللَّهِ صلى اللَّه عليه وآله :  أعتَى الناسِ مَن قَتَلَ غيرَ قاتِلِهِ ، أو ضَرَبَ غيرَ ضارِبِهِ . الأمالي للصدوق : 73 / 41 .

 The Prophet (SAWA) said, 'The most aggressive of people is he who kills someone other than his killer, or strikes someone other than one who struck him.' Amali al-Saduq, p. 28, no. 4

رسولُ اللَّهِ صلى اللَّه عليه وآله :  لَزَوالُ الدنيا جَميعاً أهوَنُ علَى اللَّهِ مِن دَمٍ سُفِكَ بغيرِ حَقٍّ . الترغيب والترهيب : 3 / 293 / 6 .

 The Prophet (SAWA) said, 'The eradication of the whole world is more insignificant for Allah than the blood that has been shed without right.' al-Targhib wa al-Tarhib, v. 3, p. 293, no. 6

رسولُ اللَّهِ صلى اللَّه عليه وآله :  أوَّلُ ما يُقضى‏ بينَ الناسِ يَومَ القِيامَةِ في الدِّماءِ . كنز العمّال : 39887 .

 The Prophet (SAWA) said, 'The first thing that will be judged between people on the Day of Resurrection is the blood shed [between them].' Kanz al-Ummal, no. 39887

رسولُ اللَّهِ صلى اللَّه عليه وآله :  مَن أعانَ على‏ قَتلِ مؤمنٍ بشَطرِ كَلِمَةٍ لَقِيَ اللَّهَ يَومَ القِيامَةِ مَكتوبٌ بينَ عَينَيهِ : آيِسٌ مِن رَحمَةِ اللَّهِ . كنز العمّال : 39895 .

 The Prophet (SAWA) said, 'Whoever helps in the killing of a believer even with a part of a word, he will meet Allah on the Day of Judgment with the following words written between his eyes: 'Doomed from the mercy of Allah.' Kanz al-Ummal, no. 39895

رسولُ اللَّهِ صلى اللَّه عليه وآله :  يا أيُّها الناسُ ، أيُقتَلُ قَتيلٌ وأنا بَينَ أظهُرِكُم لا يُعلَمُ مَن قَتَلَهُ ؟! لو أنّ أهلَ السماءِ والأرضِ اجتَمَعُوا على‏ قَتلِ رجُلٍ مُسلمٍ لَعَذَّبَهُم اللَّهُ بلا عَددٍ ولا حِسابٍ . كنز العمّال : 39952 .

 The Prophet (SAWA) said, 'O people! Will a person be killed whilst I am among you, and it is not known whom the killer is?! If all the people of the heavens and the earth were to get together and kill a Muslim [believer], Allah would punish them all without account and judgment.' Kanz al-Ummal, no. 39952