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." (RU)
English reference (RU): Vol. 3, Book 11, Hadith 2099 (RU)
Arabic reference (RU): Book 11, Hadith 2177 (RU)