EXOD382 Do not swear needless oaths. There are four types of such oaths. 1) One denies a self-evident fact (e.g. he swears that a rock is a bird). 2) One attests to a self-evident fact (e. g. swears that a rock is a rock). 3) One swears that he will not perform a mitzvah. 4) One swears to do the impossible (e.g. he will not sleep for three days). We must know and impress upon our awareness that whenever we utter the great and holy Name of Hashem, we must do so with fear, awe and trepidation, for we are saying the Name of the Unique and Almighty God. Hashem forbids needless mention of His Name. Fulfilling this command (i.e., Refraining from needless oaths) will help us better appreciate the significance of uttering His Name, so that fear and awe of Him will be in our hearts and on our faces.