Sunan an-Nasa'i 4059
سنن النسائي#4059SahihIbn 'Abbas said:"The Messenger of Allah [SAW] said: 'Whoever changes his religion, kill him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 37:94