Exo 12:2, Lev 23:24 | JFB | STEP | 2. this month shall be unto you the beginning of months —the first not only in order but in estimation. It had formerly been the seventh according to the reckoning of the civil year, which began in September, and continued unchanged, but it was thenceforth to stand first in the national religious year which began in March, April.

Exodus 12:2

2. this month shall be unto you the beginning of months—the first not only in order but in estimation. It had formerly been the seventh according to the reckoning of the civil year, which began in September, and continued unchanged, but it was thenceforth to stand first in the national religious year which began in March, April.

Leviticus 23:24

24. In the seventh month, in the first day of the month, shall ye have a sabbath—That was the first day of the ancient civil year.

a memorial of blowing of trumpets—Jewish writers say that the trumpets were sounded thirty successive times, and the reason for the institution was for the double purpose of announcing the commencement of the new year, which was (Le 23:25) to be religiously observed (see Nu 29:3), and of preparing the people for the approaching solemn feast.