Then the king ordered Ashpenaz, who was in charge of the palace officials, 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 sense, and have the poise needed to serve in the royal palace. Teach these young men the language and literature of the Babylonians."
References for Daniel 1:4
The king assigned them a daily ration of the best food and wine from his own kitchens. They were to be trained for a three-year period, and then some of them would be made his advisers in the royal court.
Daniel, Hananiah, Mishael, and Azariah were four of the young men chosen, all from the tribe of Judah.