Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:27762a –
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السيوطي:٢٧٧٦٢a –

"يَجئُ الْقَاتِلُ يَوْمَ الْقِيَامَةِ مَكْتُوبًا بَيْنَ عَيْنَيْهِ: أَيِسَ الْيَوْمَ مِنْ رَحْمَة اللَّهِ ﷻ".  

الخَطيب عن أَبى سعيد

See similar narrations below:

Collected by Bayhaqī
bayhaqi:15868 – Abū al-Ḥusayn b. al-Faḍl al-Qaṭṭān> Abū Bakr Muḥammad b. ʿUthmān b. Thābit al-Ṣaydalānī > ʿUbayd b. Sharīk al-Bazzāz > Nūḥ b. al-Haytham Khatan Ādam b. Abū Iyās > Ukhtih Biʿasqalān Sanah ʿIshrīn And Miāʾatayn > al-Faraj b. Faḍālah > al-Ḍaḥḥāk > al-Zuhrī Yarfaʿuh

“Whoever helps to kill a believer, even with half a world, he will meet Allah (SWT) with (the words) written between his eyes, 'He has no hope of the mercy of Allah (SWT).” (Using translation from Ibn Mājah 2620)   

البيهقي:١٥٨٦٨ – أَخْبَرَنَاهُ أَبُو الْحُسَيْنِ بْنُ الْفَضْلِ الْقَطَّانُ بِبَغْدَادَ ثنا أَبُو بَكْرٍ مُحَمَّدُ بْنُ عُثْمَانَ بْنِ ثَابِتٍ الصَّيْدَلَانِيُّ ثنا عُبَيْدُ بْنُ شَرِيكٍ الْبَزَّازُ ثنا نُوحُ بْنُ الْهَيْثَمِ خَتَنُ آدَمَ بْنِ أَبِي إِيَاسٍ عَلَى أُخْتِهِ بِعَسْقَلَانَ سَنَةَ عِشْرِينَ وَمِائَتَيْنِ ثنا الْفَرَجُ بْنُ فَضَالَةَ عَنِ الضَّحَّاكِ عَنِ الزُّهْرِيِّ يَرْفَعُهُ قَالَ

مَنْ أَعَانَ عَلَى قَتْلِ مُؤْمِنٍ بِشَطْرِ كَلِمَةٍ لَقِيَ اللهَ ﷻ يَوْمَ الْقِيَامَةِ مَكْتُوبٌ بَيْنَ عَيْنَيْهِ آيِسٌ مِنْ رَحْمَةِ اللهِ