Mark 6:23
And he vowed to her, "I will give you whatever you ask me for, up to one half [the wealth] of my kingdom."
Acts 23:12
When daylight came, [a group of] Jews conspired together, agreeing under oath that they would neither eat nor drink until they had killed Paul.
Matthew 14:7
[Herod was so pleased with her performance that] he promised, with an oath, to give her whatever she asked for [i.e., with limitations. See Mark 6:23].
Matthew 14:9
Now King Herod became very distressed [over such a gruesome request]; but because he had [promised with] oaths and [to look good in front of] his party guests, he ordered John's head to be given [to her].