Daniel 1:13

Then let our countenances be looked upon before thee, in a careful examination of their physical condition, and the countenance of the children that eat of the portion of the king's meat, making a comparison between these four and the youths who complied with the king's order concerning their diet; and as thou seest, according to the result of the observations made after the period, deal with thy servants, the test determining the matter once for all.