“Whereupon he promised with an oath to give her whatsoever she would ask.”
King James Version (KJV)
Mt 14:7 He promised with an oath to give her whatever she would ask. Herod confirms his promise by an oath. It was a common custom to reward a dancer or actor, on a great occasion like this, who pleased, and to ask what they wished. Herod knew that Salome danced because she had a request to make.