Daniel 1:4-8

youths in whom there was no impairment, who were good-looking, suitable for instruction in every kind of expertise, endowed with understanding and discerning knowledge, and who had ability to serve in the king’s court; and he ordered Ashpenaz to teach them the literature and language of the Chaldeans.

The king also allotted for them a daily ration from the king’s choice food and from the wine which he drank, and ordered that they be educated for three years, at the end of which they were to enter the king’s personal service.

Now among them from the sons of Judah were Daniel, Hananiah, Mishael, and Azariah.

Then the commander of the officials assigned new names to them; and to Daniel he assigned the name Belteshazzar, to Hananiah Shadrach, to Mishael Meshach, and to Azariah Abed-nego. Daniel’s Resolve

But Daniel made up his mind that he would not defile himself with the king’s choice food or with the wine which he drank; so he sought permission from the commander of the officials that he might not defile himself.