Numbers 10:10-11

10Also in the day of rejoicing, and in your appointed feasts, and at the beginnings of your months, you shall sound the trumpets over your burnt offerings, and over the sacrifice of your peace offerings; and they shall be as a reminder of you before your God. I am the Lord your God.”

11On the twentieth day of the second month in the second year [since leaving Egypt], the cloud [of the Lord’s presence] was lifted from over the tabernacle of the Testimony,