Mishkat al-Masabih #3343
Retaliation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَعَانَ عَلَى قَتْلِ مُؤْمِنٍ شَطْرَ كَلِمَةٍ لَقِيَ اللَّهَ مَكْتُوبٌ بينَ عينيهِ آيسٌ من رَحْمَة الله» . رَوَاهُ ابْن مَاجَه
Abu Huraira reported God’s Messenger as saying, “If anyone helps in killing a believer to the extent of half a word,* he will meet God with ‘Despairing of God’s mercy’ written on his forehead.”
Ibn Majah transmitted it.
* This is taken to mean that it is a serious matter even to utter half the word which expresses an intention to kill a believer.
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About Mishkat al-Masabih
This hadith is #3343 from Mishkat al-Masabih, in the Book of Retaliation.