Numbers 10:10

10:10 “Also in the time when you rejoice, such as on your appointed festivals or at the beginnings of your months, you must blow with your trumpets over your burnt offerings and over the sacrifices of your peace offerings, so that they may become a memorial for you before your God: I am the Lord your God.”

Numbers 28:14

28:14 For their drink offerings, include half a hin of wine with each bull, one-third of a hin for the ram, and one-fourth of a hin for each lamb. This is the burnt offering for each month throughout the months of the year.