سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 4064
The Book of Fighting [The Prohibition of Bloodshed]
The Ruling on Apostates
أَخْبَرَنَا الْحُسَيْنُ بْنُ عِيسَى، عَنْ عَبْدِ الصَّمَدِ، قَالَ حَدَّثَنَا هِشَامٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ ابْنَ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم مَنْ بَدَّلَ دِينَهُ فَاقْتُلُوهُ .
It was narrated from Anas that : Ibn 'Abbas said: "The Messenger of Allah [ﷺ] said: 'Whoever changes his religion, kill him.'"
Sunan an-Nasa'i, 4064Sahih (Darussalam)