Swearing by a religion other than Islam that such and such is the case

Question:
May Allah reward you with good and do you good. A listener says: Abu 'Abd al-Qadir from Riyadh, 'Ayn Qaf, says to me: My wife swears a lot and says, "I am such and such if such and such happens," and "I am such and such if such and such happens." We have advised her many times, but she has not heeded it. Please guide us regarding this matter, perhaps she will listen. May Allah reward you with good.

Answer:
It is not permissible for a person to swear by a religion other than Islam, such as saying, "I am a Jew" or "I am a Christian" if such and such is the case, or if such and such is not the case. This is based on the saying of the Messenger (peace and blessings be upon him) or he (peace and blessings be upon him) said . The point is that it is not permissible for a person to utter these words and to take himself out of the religion of Islam into the religion of disbelief in the form of an oath, because this is serious and prohibited. If a person needs to swear, he swears by Allah (Mighty and Majestic). He (peace and blessings be upon him) said . This is what is prescribed. As for swearing by a religion other than Islam, it is serious, there is a warning against it, and it is prohibited with the strongest prohibition.