Then the king ordered Ashpenaz, his chief of staff, to bring to the palace some of the young men of Judah’s royal family and other noble families, who had been brought to Babylon as captives.
“Select only strong, healthy, and good-looking young men,” he said. “Make sure they are well versed in every branch of learning, are gifted with knowledge and good judgment, and are suited to serve in the royal palace. Train these young men in the language and literature of Babylon. ”
References for Daniel 1:4
The king assigned them a daily ration of food and wine from his own kitchens. They were to be trained for three years, and then they would enter the royal service.
Daniel, Hananiah, Mishael, and Azariah were four of the young men chosen, all from the tribe of Judah.