عن أبي بكرة نفيع بن الحارث الثقفي -رضي الله عنه- أن النبي -صلى الله عليه وسلم- قال: «إذا التَقَى المسلمانِ بسَيْفَيْهِمَا فالقاتلُ والمقْتُولُ في النَّارِ». قلت: يا رسول الله، هذا القاتلُ فما بالُ المقتولِ؟ قال: «إنه كان حريصًا على قَتْلِ صَاحِبِهِ».
[صحيح.] - [متفق عليه.]
المزيــد ...

Abu Bakrah Nufaī‘ ibn al-Hārith Ath-Thaqafi (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "When two Muslims meet to fight each other with their swords, both the killer and the killed are doomed to Hell." I said: "O Messenger of Allah, that is the case with the killer, but what about the one killed?" He replied: "Indeed, he was keen to kill his companion."
[Sahih/Authentic] - [Al-Bukhari and Muslim]

Explanation

If two Muslims meet each other with their swords each intending to keel the other one, then the killer - because of his killing his fellow, and the killed because he was also eager to fight and kill the other one - both of them are doomed to Hellfire, if Allah does not pardon them.

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1: The punishment is for anyone who determines, prepares, and engages the means leading to a sin, whether he actually does it or not, unless Allah Almighty pardons him. However, he who only intends to commit a sin, yet does not take the means leading to it, this does not count as a sin.
2: It warns Muslims of fighting one another.