John Gills Exposition of the Bible Commentary - Exodus 19:11
And be ready against the third day ,.... Not the third day of the month, but the third day from hence, this being the fourth, and the morrow the fifth, and the third day, the day following that, the sixth, on which day it is generally agreed by the Jews that the law was given; see Gill on Exodus 19:16 . for the third day the Lord will come down in the sight of all the people upon Mount Sinai ; which must be understood, consistent with his omnipresence, and is only expressive of some... read more
Matthew Henry's Complete Commentary - Exodus 19:9-15
Here, I. God intimates to Moses his purpose of coming down upon mount Sinai, in some visible appearance of his glory, in a thick cloud (Exod. 19:9); for he said that he would dwell in the thick darkness (2 Chron. 6:1), and make this his pavilion (Ps. 18:11), holding back the face of his throne when he set it upon mount Sinai, and spreading a cloud upon it, Job 26:9. This thick cloud was to prohibit curious enquiries into things secret, and to command an awful adoration of that which was... read more