Daniel 1:10

And the captain of the unsexed servants said to Daniel, I am in fear of my lord the king, who has given orders about your food and your drink; what if he sees you looking less happy than the other young men of your generation? then you would have put my head in danger from the king.

Proverbs 29:25

The fear of man is a cause of danger: but whoever puts his faith in the Lord will have a safe place on high.

Matthew 6:16-18

And when you go without food, be not sad-faced as the false-hearted are. For they go about with changed looks, so that men may see that they are going without food. Truly I say to you, They have their reward.

John 12:42-43

However, a number even of the rulers had belief in him, but because of the Pharisees they did not say so openly for fear that they might be shut out from the Synagogue:

Treasury of Scripture Knowledge

Summary

And the prince of the eunuchs said unto Daniel, I fear my lord the king, who hath appointed your meat and your drink: for why should he see your faces worse liking than the children which are of your sort? then shall ye make me endanger my head to the king.

Worse liking

Bible References

I fear

Proverbs 29:25
The fear of man is a cause of danger: but whoever puts his faith in the Lord will have a safe place on high.
John 12:42
However, a number even of the rulers had belief in him, but because of the Pharisees they did not say so openly for fear that they might be shut out from the Synagogue:

Worse liking

Matthew 6:16
And when you go without food, be not sad-faced as the false-hearted are. For they go about with changed looks, so that men may see that they are going without food. Truly I say to you, They have their reward.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain