Daniel 1:11-15

Then said Daniel to the steward whom the prince of the eunuchs had appointed over Daniel, Hananiah, Mishael, and Azariah: Prove thy servants, I beseech thee, ten days; and let them give us pulse to eat, and water to drink. Then let our countenances be looked upon before thee, and the countenance of the youths that eat of the king’s dainties; and as thou seest, deal with thy servants. So he hearkened unto them in this matter, and proved them ten days. And at the end of ten days their countenances appeared fairer, and they were fatter in flesh, than all the youths that did eat of the king’s dainties.