QuranLang
"The Messenger of Allah said: 'Whoever says: I have nothing to do with Islam, if he is lying then he is as he said, and if he is telling the truth, his Islam will not be sound.'"
Sunan an-Nasa'i Book 35, Hadith 12
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"Whoever swears by a religion other than Islam, telling a lie, will be as he said, and whoever kills himself with something will be punished with it in the Hereafter."
Sunan an-Nasa'i Book 35, Hadith 11
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"You are setting up rivals (to Allah) and associating others (with Him). You say: 'Whatever Allah wills and you will,' and you say: 'By the Ka'bah.'" So the Prophet commanded them, if they wanted to swear an oath, to say: "By the Lord of the Ka'bah;" and to say: "Whatever Allah wills, then what you will."
Sunan an-Nasa'i Book 35, Hadith 13