Chapter 35: The Book of Oaths and Vows
It was narrated that Thabit bin Ad-Dahhak said: "The Messenger of Allah said: 'Whoever swears by a religion other than Islam, telling a lie, will be as he said.'"
In his narration, Qutaibah said: "Intentionally." Yazid said: "Telling a lie will be as he said, and whoever kills himself with something. Allah will punish him with it in the Fire of Hell."
Sunan an-Nasa'i 3770