Exodus 19:16

Exo 19:16 And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that [was] in the camp trembled.

Ver. 16. There were thunders and lightnings. ] The law was delivered in this terrible manner; partly to procure reverence to the doctrine of it, and partly to set forth the nature and office of it; which is to terrify and thunder struck offenders.