What is the significance of the word "Leya'asreka" ('to chastise you') mentioned in connection with Hashem's Voice that they heard on Har Sinai and the fire that they saw there?
Seforno: Hashem frightened them when He showed them theses things, in order to raise them to the level of prophets. 1
How will reconcile the fact that Hashem's Voice was heard from the Heaven whilst His Fire and words appeared on Har Sinai?
Rashi and Ramban: Refer to Shemos, 20:19:3:1, 2 & 3.