Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Two people will not be gathered together in Hell in a way that one of them harms the other." It was said: O Messenger of Allah (peace and blessings be upon him), who is that? He (peace and blessings be upon him) said: "A believer who kills a disbeliever and then remains on the straight path."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18530
Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "A disbeliever and the one who killed him will never be gathered together in Hell."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18531