The Reality of a Casual Oath

Tell us about a casual oath, as His Eminence the Shaykh says?
Answer: Allah the Exalted says: [al-Baqarah:225] This is in Surat al-Baqarah, and in Surat al-Ma'idah He says : [al-Ma'idah:89] So a casual oath is an oath that one's heart did not commit to and one did not intend, but it slipped from one's tongue without intent, in the course of one's speech, such as saying "By Allah" or "No, by Allah" in the course of speech without intending the oath and without intending to make it. Such an oath is void.
Similarly, if one swears to something believing it to be true, but it turns out to be false, such as saying, "By Allah, I saw so-and-so," and then it becomes clear to him that it was someone who resembled him, not so-and-so, and he believed he was correct, this is a casual oath.
As for when one intends the oath and commits to it in one's heart, there is an expiation for it, because he intended it when he said, "By Allah, I will certainly do such-and-such," "By Allah, I will certainly visit so-and-so," "By Allah, I will not visit so-and-so," "By Allah, I will not speak to him," or "By Allah, I will speak to him," intending that. This is a binding oath; if he breaks it, the expiation becomes obligatory upon him. Yes.
The presenter: May Allah reward you with good.