Exodus 19:11

11 and be ready the day after tomorrow. On that day I will come down on Mount Sinai, where all the people can see me.

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 The Lord said to Moses, "I will come to you in a thick cloud, so that the people will hear me speaking with you and will believe you from now on." Moses told the Lord what the people had answered,
10 and the Lord said to him, "Go to the people and tell them to spend today and tomorrow purifying themselves for worship. They must wash their clothes
11 and be ready the day after tomorrow. On that day I will come down on Mount Sinai, where all the people can see me.
12 Mark a boundary around the mountain that the people must not cross, and tell them not to go up the mountain or even get near it. If any of you set foot on it, you are to be put to death;
13 you must either be stoned or shot with arrows, without anyone touching you. This applies to both people and animals; they must be put to death. But when the trumpet is blown, then the people are to go up to the mountain."
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.