Psalm 81:4

New American Bible - revised edition

Blow the shofar at the new moon, at the full moon, on our solemn feast.

Cross References

Numbers 10:10

And when you rejoice on your festivals, and your new-moon feasts, you shall blow the trumpets over your burnt offerings and your communion sacrifices, so that this serves as a reminder of you before your God. I, the Lord, am your God. Departure from Sinai.

Numbers 28:11

On your new moons you will offer as a burnt offering to the Lord two bulls of the herd, one ram, and seven unblemished yearling lambs,