2,633. Verbalizing One's Oath
Hilchos Shevuos 2:10
Let’s say that someone intends to take an oath and he decides not to eat that day, or not to drink, and he intends to prohibit that action to himself with an oath. If he doesn’t actually verbalize his intentions, it remains permitted since Leviticus 5:4 specifies, “expressing with his lips,” meaning that one who takes an oath isn’t liable until he actually makes the oath with his lips.
Hilchos Shevuos 2:11
Similarly, if one decides to take an oath but he makes a mistake and what he said isn’t what he meant, the thing in question remains permitted. For example, if one had the intention not to eat in Reuven’s home, but he verbally expressed that he wouldn’t eat in Shimon’s home, he remains permitted to eat in Reuven’s home because he didn’t express otherwise. He is likewise permitted to eat in Shimon’s home because he didn’t have the intention to prohibit Shimon.