Exodus 19:11

11 and have been prepared for the third day; for on the third day doth Jehovah come down before the eyes of all the people, on mount Sinai.

Exodus 19:11 Meaning and 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 visible display of his power, and of some sensible token of his presence to the people; he was now upon it in the pillar of cloud, but then he would appear in another manner, and descend in a thick cloud and fire, which all the people would see, though they could not see the similitude of anything in it.

Exodus 19:11 In-Context

9 And Jehovah saith unto Moses, `Lo, I am coming unto thee in the thickness of the cloud, so that the people hear in My speaking with thee, and also believe in thee to the age;' and Moses declareth the words of the people unto Jehovah.
10 And Jehovah saith unto Moses, `Go unto the people; and thou hast sanctified them to-day and to-morrow, and they have washed their garments,
11 and have been prepared for the third day; for on the third day doth Jehovah come down before the eyes of all the people, on mount Sinai.
12 `And thou hast made a border [for] the people round about, saying, Take heed to yourselves, going up into the mount, or coming against its extremity; whoever is coming against the mount is certainly put to death;
13 a hand cometh not against him, for he is certainly stoned or shot through, whether beast or man it liveth not; in the drawing out of the jubilee cornet they go up into the mount.'
Young's Literal Translation is in the public domain.