Matthew 5:36
Neither shall you swear by your head, for you can’t make one hair white or black.
World English Bible (Public Domain)
In context
Before · Matthew 5:34–35
34but I tell you, don’t swear at all: neither by heaven, for it is the throne of God; 35nor by the earth, for it is the footstool of his feet; nor by Jerusalem, for it is the city of the great King.
36Neither shall you swear by your head, for you can’t make one hair white or black.