The Messenger of Allah ﷺ said, "Whoever changes his religion, kill him."
أخبرنا عمران بن موسى قال حدثنا عبد الوارث قال حدثنا أيوب عن عكرمة قال
قال رسول الله ﷺ من بدل دينه فاقتلوه
No references are available.
Bukhari narrated it in the chapter on jihad, "The prohibition of punishing with Allah's punishment," hadith 3017, from the hadith of Ayub Sakhtiyani, at greater length, and it is also in Kubra, hadith 3522.