Daniel 1:10-12

10 however, the chief officer said to Dani’el, “I’m afraid of my lord the king. After all, he has given you an allowance of food and drink; so if he were to see you boys looking worse than the others your age, you would be putting my own head in danger from the king.”

11 Then Dani’el said to the guard whom the chief officer had put in charge of Dani’el, Hananyah, Misha’el and ‘Azaryah,

12 “Please! Try an experiment on your servants — for ten days have them give us only vegetables to eat and water to drink.