What is the ruling on killing an assailant (ṣāʾil) and a rebellious group (fiʾah bāghiyah), and do they fall under the three cases mentioned in the Hadith where shedding a Muslim's blood becomes lawful?

It is established that an aggressor (ṣāʾil) may be killed to repel their harm, and a rebellious group (fiʾah bāghiyah) may be fought. However, scholars differ on the ruling concerning killing others, and whether it falls under the three matters mentioned in the hadith: "The blood of a Muslim person is not lawful except in one of three cases: the married fornicator, a life for a life, and one who abandons his religion and separates from the community." Some scholars hold that the hadith is general and the aggressor is an exception to it, or that the aggressor is included in "one who separates from the community." Others believe that the hadith is abrogated by other verses and hadiths that permit killing in cases other than the three mentioned, such as sorcery, insulting Allah or the prophets, killing a sodomite, and abandoning prayer. The correct view is that many of these cases fall under "one who abandons his religion and separates from the community" or represent repelling an aggressor.