Commentaries:
Jamieson, Fausset, and Brown
ARRIVAL AT SINAI. (Exo. 19:1-25)
In the third month—according to Jewish usage, the first day of that month—"same day."—It is added, to mark the time more explicitly, that is, forty-five days after Egypt—one day spent on the mount (Exodus 19:3), one returning the people's answer (Exodus 19:7-8), three days of preparation, making the whole time fifty days from the first passover to the promulgation of the law. Hence the feast of pentecost, that is, the fiftieth day, was the inauguration of the Old Testament church, and the divine wisdom is apparent in the selection of the same reason for the institution of the New Testament church (John 1:17; Acts 2:1).
Other Jamieson, Fausset, and Brown entries containing Exodus 19:1:
Exodus 18:1-5
Exodus 40:2
Numbers 10:11
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