Numbers 28:11 (BSB)

At the beginning of every month, you are to present to the LORD a burnt offering of two young bulls, one ram, and seven male lambs a year old, all unblemished,

From Numbers 28. Also in the ESV.

Commentary on Numbers 28:11

Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 28:9-15: The new moons and the sabbaths are often spoken of together, as great solemnities in the Jewish church, very comfortable to the saints then, and typical of gospel grace. Now we have here the sacrifices appointed, 1. For the sabbaths.
John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 28:11: And in the beginnings of your months ye shall offer a burnt offering unto the Lord,.... On the first day of every month, when the new moon appeared; that this was religiously observed appears from the blowing of the trumpets over the sacrifices on this day, from attendance on the word of the Lord, by his prophets, on this day, and from abstinence from worldly business on it, Num 10:10.
Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 28:11: And in the beginnings of your months ye shall offer a burnt offering unto the Lord--These were held as sacred festivals; and though not possessing the character of solemn feasts, they were distinguished by the blowing of trumpets over the sacrifices (Num 10:10), by the suspension of all labor except the domestic occupations of women (Amo 8:5), by the celebration of public worship (Kg2 4:23)...
Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 28:11-15: Num 28:11-15 At the beginnings of the month, i.e., at the new moons, a larger burnt-offering was to be added to the daily or continual burnt-offering, consisting of two bullocks (young oxen), one ram, and seven yearling lambs, with the corresponding meat and drink-offerings, as the “month’s burnt-offering in its (i.e., every) month with regard to the months of the year,” i.e., corresponding to them.