Sayyiduna Abu al-Darda (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "The slain man will sit on the road, and when the killer passes by him, the slain man will seize him and submit: 'O my Lord! This man brought an end to my prayer and my fasting.'" The Prophet (peace and blessings be upon him) said: "Then the killer and the one who ordered the killing will be punished."
Al-Tabarani recorded this narration; its chain contains Shahr bin Hawshab, who has been declared thiqah (trustworthy), and there is weakness in him. (Allamah al-Haythami says:) I say: Further on will come the hadiths stating that reviling a Muslim is sinful disobedience and fighting him is disbelief; these (narrations) will come in the Book of Manners.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الفتن - أعاذنا الله منها / 12323