Numbers 10:9-12

⁹And if you go to war in your land against any who do you wrong, then let the loud note of the horn be sounded; and the Lord your God will keep you in mind and give you salvation from those who are against you.

¹⁰And on days of joy and on your regular feasts and on the first day of every month, let the horns be sounded over your burned offerings and your peace-offerings; and they will put the Lord in mind of you: I am the Lord your God.

¹¹Now in the second year, on the twentieth day of the second month, the cloud was taken up from over the Tent of witness.

¹²And the children of Israel went on their journey out of the waste land of Sinai; and the cloud came to rest in the waste land of Paran.