It is narrated from Sayyiduna Mu'awiyah bin Abi Sufyan (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) say: "There is no sin but that it is hoped Allah will forgive it, except the one who is a polytheist or who kills a believer deliberately."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16905
It is narrated from Sayyiduna Mu'awiyah (may Allah be pleased with him), and he used to narrate very few hadith from the Messenger of Allah (peace and blessings be upon him), that the Messenger of Allah (peace and blessings be upon him) said: "It is hoped that every sin will be forgiven, except that a man dies while he is a disbeliever or kills a believer deliberately."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16906
Abu Idris al-Khawlani narrates: I heard Sayyiduna Mu'awiyah (may Allah be pleased with him) say: I heard the Messenger of Allah (peace and blessings be upon him) say: "Concerning every sin it is hoped that Allah will forgive it, except the man who dies a disbeliever or the one who kills a believer deliberately."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16907