Deuteronomy 20:2

¹²Behold, God is with us at our head, and his priests with the trumpets of alarm to sound an alarm against you. Children of Israel, don’t fight against the LORD, the God of your fathers; for you will not prosper.”

⁸“The sons of Aaron, the priests, shall blow the trumpets. This shall be to you for a statute forever throughout your generations. ⁹When you go to war in your land against the adversary who oppresses you, then you shall sound an alarm with the trumpets. Then you will be remembered before the LORD your God, and you will be saved from your enemies.

⁶Moses sent them, one thousand of every tribe, to the war with Phinehas the son of Eleazar the priest, to the war, with the vessels of the sanctuary and the trumpets for the alarm in his hand.

¹⁸Saul said to Ahijah, “Bring God’s ark here.” For God’s ark was with the children of Israel at that time.

²⁷The children of Israel asked the LORD (for the ark of the covenant of God was there in those days, ²⁸and Phinehas, the son of Eleazar, the son of Aaron, stood before it in those days), saying, “Shall I yet again go out to battle against the children of Benjamin my brother, or shall I cease?” The LORD said, “Go up; for tomorrow I will deliver him into your hand.”

⁷David said to Abiathar the priest, the son of Ahimelech, “Please bring the ephod here to me.” Abiathar brought the ephod to David.

⁸David inquired of the LORD, saying, “If I pursue after this troop, will I overtake them?” He answered him, “Pursue, for you will surely overtake them, and will without fail recover all.”