Psalms 81:3 KJV

Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day.
Psalms 81:3, King James Version

In context

2 Take a psalm, and bring hither the timbrel, the pleasant harp with the psaltery.

3 Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day.

4 For this was a statute for Israel, and a law of the God of Jacob.