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