Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "Whoever takes part in an unjust killing with even half a word, when he comes on the Day of Resurrection, it will be written between his two eyes: 'This one is despairing of the mercy of Allah.'"
Al-Tabarani recorded this narration; its chain contains Abdullah bin Khirash, whom al-Bukhari (may Allah have mercy on him) and a group declared da'if (weak), while Ibn Hibban declared him thiqah (trustworthy) and said: He sometimes makes mistakes. The remaining narrators of this narration are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الفتن - أعاذنا الله منها / 12315
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (11102) ، أخرجه المعجم الكبير للطبراني برقم: 11102»