Matthew Poole and continuators on Exodus 19:1

1 IN the third month when the children of Israel were gone forth out of the land of Egypt, the same day came they into the wilderness of Sinai.

Heb. Third new moon, called Sivan, including the latter part of May, and the former part of Iune.

Heb. in that day, to wit, when the moneth or new-moon began, and when they departed from Rephidim, to note, that there was no Station between these two. This is set down thus accurately, because it gives an account of the original of the feast of Pentecost, because the giving of the Law, which was 3 or 4 days after this time, was 50 days after the Passeover, whereof 46 or 47 were past at their first coming to Sinai, reckoning from the 15th. day of the first moneth, when they came out of Egypt, to this time.

Marginal references: Num. 33. 15.