The Prophet (p.b.u.h) said, "Whoever intentionally swears falsely by a religion other than Islam, then
he is what he has said, (e.g. if he says, 'If such thing is not true then I am a Jew,' he is really a Jew).
And whoever commits suicide with piece of iron will be punished with the same piece of iron in the
Hell Fire." Narrated Jundab the Prophet (ﷺ) said, "A man was inflicted with wounds and he committed
suicide, and so Allah said: My slave has caused death on himself hurriedly, so I forbid Paradise for
him." - Hadith Al Bukhari 1364 (islam)
Book 23, Hadith 116
Vol. 2, Book 23, Hadith 445