And in the seventh month
 The month Tisri, as the Targum of Jonathan, which answers to part of our September and October; a month famous for days to be religiously observed, having more of them in it than any other month in the year: 
 on the first day of the month, ye shall have a holy convocation;
 see ( Leviticus 23:24 ) , 
 ye shall do no servile work;
 therefore, in the place referred to, is called a sabbath: 
 it is a day of blowing the trumpets unto you;
 of which, (See Gill on  Leviticus 23:24).