Daniel
Daniel 5:6BSB·traditional attribution

his face grew pale and his thoughts so alarmed him that his hips gave way and his knees knocked together.

John Calvin Reformed @genevareformer

Here Daniel shews how the king’s mind was struck with fear, lest any one should think his fright without foundation. But he expresses, by many circumstances, how disturbed the king was, and thus the sufficiency of the reason would easily appear. It was needful for him to be so struck, that all might understand how God was seated on his throne, and summoned him as a criminal.

Matthew Henry Presbyterian @wholebiblehenry

We have here Belshazzar the king very gay, but all of a sudden very gloomy, and in straits in the fulness of his sufficiency. See how he affronts God, and God affrights him; and wait what will be the issue of this contest; and whether he that hardened his heart against God prospered. I. See how the king affronted God, and put contempt upon him.

Commenting on Daniel 5:1-9

John Gill Reformed Baptist @doctorgill

Then the kings countenance changed,.... Or, "his brightness" (l); his ruddy countenance, his florid looks, his gay airs; all his jollity and mirth, that appeared in his face, were changed into paleness, sadness, and confusion: and his thoughts troubled him; what should be the meaning of this; perhaps he might immediately fear it presaged ruin and destruction to him; the sins of his former life...