The Book of Fighting [The Prohibition of Bloodshed]
37/14. Chapter:
The Ruling on Apostates
Sunan an-Nasai
أَخْبَرَنَا عِمْرَانُ بْنُ مُوسَى، قَالَ حَدَّثَنَا عَبْدُ الْوَارِثِ، قَالَ حَدَّثَنَا أَيُّوبُ، عَنْ عِكْرِمَةَ، قَالَ قَالَ ابْنُ عَبَّاسٍ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ بَدَّلَ دِينَهُ فَاقْتُلُوهُ " .
Ibn 'Abbas said: "The Messenger of Allah [SAW] said: 'Whoever changes his religion, kill him.'"
Reference : Sunan an-Nasa'i 4059In-book reference : Book 37, Hadith 94English translation : Vol. 5, Book 37, Hadith 4064