that he promised with an oath to give her whatever she asked.
Read Matthew 14:7 Using Other Translations
Whereupon he promised with an oath to give her whatsoever she would ask.
so that he promised with an oath to give her whatever she might ask.
so he promised with a vow to give her anything she wanted.
Scripture quoted by permission. Quotations designated (NIV) are from THE HOLY BIBLE: NEW INTERNATIONAL VERSION®. NIV®. Copyright © 1973, 1978, 1984, 2011 by Biblica. All rights reserved worldwide.
(New International Version Bible Online)