John Gill Commentary Numbers 29

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, you shall have a holy convocation ; see (Leviticus 23:24) ,

you shall do no servile work ; therefore, in the place referred to, is called a sabbath:

it is a day of blowing the trumpets to you ; of which, (See Gill on Leviticus 23:24).

And ye shall offer a burnt offering for a sweet savour unto the
Lord
Which was as follows:

one young bullock, one ram, and seven lambs of the first year without
blemish ,
which was the same, only one bullock less, with the offerings on the first day of the month, the seven days of unleavened bread, and the day of the firstfruits, (Numbers 28:11Numbers 28:19Numbers 28:27) .

Which went along with the creatures offered for a burnt offering; the quantity of flour and oil used in it was the same, for a bullock, a ram, and each lamb, as in the offerings at the new moons, feast of unleavened bread and the day of firstfruits, (Numbers 28:10Numbers 28:13Numbers 28:20Numbers 28:21Numbers 28:28Numbers 28:29) and a kid of the goats was also offered for a sin offering at this time, as in those seasons, and for the same purpose, to make atonement for the sins of their holy things.

(See Gill on Numbers 29:3).

(See Gill on Numbers 29:3).