Musnad Ahmad 311:8

'Ali ibn 'Asim narrated to us, from Khalid, from Abu Qilabah, from Thabit ibn al-Dahhak, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever swears by a religion other than Islam, lying and intentionally, then he is as he said. And whoever kills himself with something, Allah will punish him with it in the Fire of Hell."