Don’t even swear by your own head, because you cannot make one hair on your head become white or black.
Don’t swear an oath using the name of the earth, because the earth belongs to God. Don’t swear an oath using the name of Jerusalem, because that is the city of the great King.
Say only yes if you mean yes, and no if you mean no. If you say more than yes or no, it is from the Evil One.
You cannot add any time to your life by worrying about it.