Daniel 1:5-8

The king assigned a daily ration for them from his finest food and from the wine which he drank. They were to be educated and nourished this way for three years so that at the end of that time they were [prepared] to enter the king’s service. Among them from the sons of Judah were: Daniel, Hananiah, Mishael, and Azariah. The commander of the officials gave them [Babylonian] names: Daniel he named Belteshazzar, Hananiah he named Shadrach, Mishael he named Meshach, and Azariah he named Abed-nego. But Daniel made up his mind that he would not defile (taint, dishonor) himself with the king’s finest food or with the wine which the king drank; so he asked the commander of the officials that he might [be excused so that he would] not defile himself. [Num 6:1-4; 1 Cor 10:21]