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.'" (ES)
English reference (ES): Vol. 3, Book 11, Hadith 2098 (ES)
Arabic reference (ES): Book 11, Hadith 2176 (ES)