Daniel 1:10-14

The commander of the officials said to Daniel, “I am afraid of my lord the king, who has allotted your food and your drink; for why should he see your faces looking gaunt in comparison to the youths who are your own age? Then you would make me forfeit my head to the king.”

But Daniel said to the overseer whom the commander of the officials had appointed over Daniel, Hananiah, Mishael, and Azariah,

“Please put your servants to the test for ten days, and let us be given some vegetables to eat and water to drink.

Then let our appearance be examined in your presence and the appearance of the youths who are eating the king’s choice food; and deal with your servants according to what you see.”

So he listened to them in this matter, and put them to the test for ten days.