Contradiction with Matthew 5:37
This verse advises to simply say 'Yes' or 'No,' contradicting the oath made in Matthew 14:7.
Matthew 5:37: But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Contradiction with James 5:12
This verse discourages swearing oaths, conflicting with Herod's sworn promise in Matthew 14:7.
James 5:12: But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and [your] nay, nay; lest ye fall into condemnation.