Moses
Numbers 28:11ESV·traditional attribution

“At the beginnings of your months, you shall offer a burnt offering to the LORD: two bulls from the herd, one ram, seven male lambs a year old without blemish;

Matthew Henry Presbyterian @wholebiblehenry

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.

Commenting on Numbers 28:9-15

John Gill Reformed Baptist @doctorgill

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 @jfbcommentary

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)...