“Again you have heard that it was said to those of old, ‘You shall not swear falsely, but shall perform to the Lord what you have sworn.’ But I say to you, Do not take an oath at all, either by heaven, for it is the throne of God, or by the earth, for it is his footstool, or by Jerusalem, for it is the city of the great King. And do not take an oath by your head, for you cannot make one hair white or black. Let what you say be simply ‘Yes’ or ‘No’; anything more than this comes from evil.
Matthew 5:33-37
Be a person of your word, not requiring any oath to substantiate your actions. Simply say yes or no, and do what you say.
The beauty of integrity is in its simplicity. It is uncomplicated sincerity with nothing to gain, and nothing to lose. It is liberating; it allows you to live free of extraneous and unnecessary commitment. You are elevated in the eyes of God and others when you are known as one who can be relied on because you always do what you say.
The Core of the Bible 