As per Abdur Rahman bin al-Baylamaani (ra), a Muslim killed a man who was either a Jew or a Christian. This was reported to Prophet Muhammed ﷺ and he said: "I'm most responsible of all for fulfilling the rights of those under my care (non-Muslim citizens)." Then he ordered the killing of that Muslim man as a punishment for him, and he was killed.
*References:*
_1. Musnad by Imam Abu Hanifa, p. 104_
_2. Musnad by Imam Shafaee, p. 343_
_3. Al-Sunan Al-Kubra by Imam Bayhaqi, 8:30_
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Source: _ The Quran Foundation, Tolichowki, Hyd_
_www.quranfoundation.org_