Original Verse:
Ecclesiastes Chapter 10 Verse 7I have seen servants on horses, and rulers walking on the earth as servants.

Reference Verses:
Esther Chapter 6 Verse 8Let them take the robes which the king generally puts on, and the horse on which the king goes, and the crown which is on his head:
Proverbs Chapter 19 Verse 10Material comfort is not good for the foolish; much less for a servant to be put over rulers.
Proverbs Chapter 30 Verse 22A servant when he becomes a king; a man without sense when his wealth is increased;