Mark 6:21 (KJV)

Therefore Herodias had a quarrel against him, and would have killed him; but she could not:

For Herod feared John, knowing that he was a just man and an holy, and observed him; and when he heard him, he did many things, and heard him gladly.

And when a convenient day was come, that Herod on his birthday made a supper to his lords, high captains, and chief estates of Galilee;

And when the daughter of the said Herodias came in, and danced, and pleased Herod and them that sat with him, the king said unto the damsel, Ask of me whatsoever thou wilt, and I will give it thee.

And he sware unto her, Whatsoever thou shalt ask of me, I will give it thee, unto the half of my kingdom.