Abdur Rahman bin Abi Layla عبد الرحمن بن أبي ليلى · The Chapters on Legal Punishments

“It is not lawful to shed the blood of a Muslim who bears witness that none has the right to be worshiped but Allah (SWT), and that I am the Messenger of Allah (ﷺ), except in one of three cases: a soul for a soul; a married person who commits adultery, and one who leaves his religion and splits from the Jama`ah.”

“Whoever brandishes weapons against us is not one of us.'”