What is the legal status of saying "By Allah, I do such-and-such"?

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Saying, 'By Allah, I do such-and-such' is not an oath because it is not answered with the response formula of an oath. Consequently, stating 'By Allah, I do such-and-such' is invalid as an oath. This invalidity applies similarly to 'By Allah, I do such-and-such' because the form using the second-person address (the 'ta' particle, implying addressing another) is not exclusive to oaths and suggests a request, thus not necessitating expiation.