Matthew 5:33-37 New King James Version (NKJV)

Jesus Forbids Oaths

³³ “Again you have heard that it was said to those of ^[a]old, ‘You shall not swear falsely, but shall perform your oaths to the Lord.’ ³⁴ But I say to you, do not swear at all: neither by heaven, for it is God’s throne; ³⁵ nor by the earth, for it is His footstool; nor by Jerusalem, for it is the city of the great King. ³⁶ Nor shall you swear by your head, because you cannot make one hair white or black. ³⁷ But let ^[b]your ‘Yes’ be ‘Yes,’ and your ‘No,’ ‘No.’ For whatever is more than these is from the evil one.