Daniel 1:6

youths in whom was no blemish, but well-favored, and skillful in all wisdom, and endowed with knowledge, and understanding science, and such as had ability to stand in the king's palace; and that he should teach them the learning and the language of the Chaldeans.

The king appointed for them a daily portion of the king's dainties, and of the wine which he drank, and that they should be nourished three years; that at its end they should stand before the king.

The prince of the eunuchs gave names to them: to Daniel he gave [the name of] Belteshazzar; and to Hananiah, [of] Shadrach; and to Mishael, [of] Meshach; and to Azariah, [of] Abednego.

But Daniel purposed in his heart that he would not defile himself with the king's dainties, nor with the wine which he drank: therefore he requested of the prince of the eunuchs that he might not defile himself.