Matthew 5:35

nor by the earth, for it is His footstool; nor by Jerusalem, for it is the city of the great King.

Surrounding context

5:34 But I say to you, do not swear at all: neither by heaven, for it is God's throne;

5:35 nor by the earth, for it is His footstool; nor by Jerusalem, for it is the city of the great King.

5:36 Nor shall you swear by your head, because you cannot make one hair white or black.