Verse 18 That might be touched. It would seem that this must contain an allusion to the prohibition recorded in Hebrews 12:18; Exodus 19:12,13, where bounds were directed to be placed about Mount Sinai, which the people were forbidden to transcend;--a prohibition which added much to the effect produced by the other circumstances here alluded to, in investing the scene which accompanied the giving of the law on Sinai with its extraordinary terrors.