The Torah commands in Parashat Ekeb (Debarim 10:20), “U’bi’shmo Tishabe’a” – “In His Name shall you swear.” The Sefer Ha’hinuch understands this verse as introducing a command to swear with Hashem’s Name when it becomes necessary to take an oath. He explains that when a person invokes Hashem’s Name when swearing, and realizes that he must not violate his word because he swore with Hashem’s Name, his faith in Hashem is reinforced. He attains a higher level of awareness of Hashem’s existence through the recognition of the authority that the mention of G-d’s Name lends the oath. This Misva applies in all times and places, and is binding upon both men and women. One who refuses to swear by Hashem’s Name when he must take an oath has transgressed this affirmative command. The Sefer Ha’hinuch’s discussion of this Misva follows the view of the Rambam. The Ramban, as the Sefer Ha’hinuch notes, disagrees, and maintains that there is never a Misva to take an oath.