LEV346 It is a negative commandment not to swear an oath of expression over a falsehood as Scripture says, And you shall not swear by My name falsely [this verse], this being called an oath of expression. A person is punishable for this if he takes a [false] oath over things that it is possible to do, whether in the future or in the past: for example, "that I ate" or "I threw a stone into the sea," or "that so-and so spoke with so-and so," or "that I did not eat" or "I did not throw a stone into the sea," or "that so-and-so did not talk with so-and-so." And in the future: for example, "that I shall eat" or "I shall not eat," or "that I shall throw a pebble, or a stone, into the sea" or "I will not throw." If a person swore to one of these statements, he would violate this prohibition.