Moses
Leviticus 25:9ESV·traditional attribution

Then you shall sound the loud trumpet on the tenth day of the seventh month. On the Day of Atonement you shall sound the trumpet throughout all your land.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The general institution of the jubilee, Lev 25:8. etc. 1. When it was to be observed: after seven sabbaths of years (Lev 25:8), whether the forty-ninth or fiftieth is a great question among learned men: that it should be the seventh sabbatical year, that is, the forty-ninth (which by a very common form of speech is called the fiftieth), seems to me...

Commenting on Leviticus 25:8-22

John Gill Reformed Baptist @doctorgill

Then shall thou cause the trumpet of the jubilee to sound,.... At the end of forty nine years, or at the beginning of the fiftieth; or "the trumpet of a loud sound"; for here the word "jubilee" is not, which, according to some, was so called from the peculiar sound of the trumpet on this day, different from all others; though others, as Ben Melech...

Jamieson-Fausset-Brown Reformed @jfbcommentary

THE JUBILEE. (Lev. 25:8-23) thou shalt number seven sabbaths of years--This most extraordinary of all civil institutions, which received the name of "Jubilee" from a Hebrew word signifying a musical instrument, a horn or trumpet, began on the tenth day of the seventh month, or the great day of atonement, when, by order of the public authorities, the sound of trumpets proclaimed the beginning of the universal redemption.

Commenting on Leviticus 25:8-23