It was narrated from 'Abdullah, who is Ibn Mas`ud, that the Messenger of Allah (ﷺ) said:
"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." (RU)
English reference (RU): Vol. 3, Book 20, Hadith 2534 (RU)
Arabic reference (RU): Book 20, Hadith 2631 (RU)