Jesus teaching on oaths

Mt 5:33 Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:

Mt 5:34 But I say unto you, Swear not at all; neither by heaven; for it is God's throne:

Mt 5:35 Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King.

Mt 5:36 Neither shalt thou swear by thy head, because thou canst not make one hair white or black.

Mt 5:37 But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.