(8) باب الْحَلِفِ بِالْبَرَاءَةِ مِنَ الإِسْلاَمِ
It was narrated from 'Abdullah bin Buraidah that his father said:
"The Messenger of Allah said: 'Whoever says: I have nothing to do with Islam, if he is lying then he is as he said, and if he is telling the truth, his Islam will not be sound.'"
Reference: Sunan an-Nasa'i 3772
In-book reference: Book 35, Hadith 12
English translation: Vol. 4, Book 35, Hadith 3803