حَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، أَنْبَأَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَيُّوبَ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏(‏مَنْ بَدَّلَ دِينَهُ فَاقْتُلُوهُ ‏)‏‏.‏

It was narrated from Ibn`Abbas that the Messenger of Allah (PBUH) said: “Whoever changes his religion, execute him.” Translation Not Available

Book reference: Sunan Ibn Majah Book 20 Hadith 2535
Web reference: Sunan Ibn Majah Volume 3 Book 20 Hadith 2535