It was narrated that Thabit bin Ad-Dahhak said:
The Messenger of Allah (ﷺ) said: 'Whoever takes an oath to follow a religion other than Islam, telling a deliberate lie, he will be as he said.'" (AR)
English reference (AR): Vol. 3, Book 11, Hadith 2098 (AR)
Arabic reference (AR): Book 11, Hadith 2176 (AR)