Moses
Numbers 15:4ESV·traditional attribution

then he who brings his offering shall offer to the LORD a grain offering of a tenth of an ephah of fine flour, mixed with a quarter of a hin of oil;

Matthew Henry Presbyterian @wholebiblehenry

Here we have, I. Full instructions given concerning the meat-offerings and drink-offerings, which were appendages to all the sacrifices of animals. The beginning of this law is very encouraging: When you come into the land of your habitation which I give unto you, they you shall do so and so, Num 15:2.

Commenting on Numbers 15:1-21

John Gill Reformed Baptist @doctorgill

Then shall he that offereth his offering unto the Lord,.... Be it of either kind before mentioned: bring a meat offering of a tenth deal of flour, mingled with the fourth part of an hin of oil; this was made of the tenth part of an ephah, or of an omer of fine wheaten flour, which was the quantity of about three quarts; and which...

Jamieson-Fausset-Brown Reformed @jfbcommentary

tenth deal--that is, an omer, the tenth part of an ephah (Exo 16:36). fourth part of an hin of oil--This element shows it to have been different from such meat offerings as were made by themselves, and not merely accompaniments of other sacrifices.