Then Moses went up to God, and the LORD called to him from the mountain, “This is what you are to tell the house of Jacob and explain to the sons of Israel:
3. And Moses went up. It is probable that Moses sought, as he was wont, retirement., in order to take counsel of God; for he speaks not as of some new or unusual circumstance, but of a custom previously observed; because he dared not stop anywhere, nor make any further advances, except as far as was prescribed him by the mouth of God.
Here is, I. The date of that great charter by which Israel was incorporated. 1. The time when it bears date (Exo 19:1) - in the third month after they came out of Egypt. It is computed that the law was given just fifty days after their coming out of Egypt, in remembrance of which the feast of Pentecost was observed the fiftieth day after...
Commenting on Exodus 19:1-8
And Moses went up unto God,.... Who was in the pillar of cloud upon the top of the mount; this was on the second day, according to the Targum of Jonathan: "the Lord called unto him out of the mountain"; or had called unto him, as Aben Ezra, since without his leave he could not have gone up.