It was narrated from Anas that the Messenger of Allah (ﷺ) heard a man say:
"If that happens, I will be a Jew." The Messenger of Allah (ﷺ) said: 'That is guaranteed." (JA)
English reference (JA): Vol. 3, Book 11, Hadith 2099 (JA)
Arabic reference (JA): Book 11, Hadith 2177 (JA)