Joshua 6:12-14

And Joshua rose early in the morning, and the priests took up the ark of the LORD. Then seven priests bearing seven trumpets of rams’ horns before the ark of the LORD went on continually and blew with the trumpets. And the armed men went before them. But the rear guard came after the ark of the LORD, while the priests continued blowing the trumpets. And the second day they marched around the city once and returned to the camp. So they did six days.