Joshua 6:12-14

Then Joshua got up early in the morning [on the second day], and the priests took up the ark of the LORD. The seven priests carrying the seven trumpets made of rams’ horns ahead of the ark of the LORD went on continually, blowing the trumpets; and the armed men went ahead of them and the rear guard came after the ark of the LORD, while the priests continued to blow the trumpets. On the second day they marched around the city once, and returned to the camp; they did this for six days.