New Revised Standard Version
See, God is with us at our head, and his priests have their battle trumpets to sound the call to battle against you. O Israelites, do not fight against the LORD, the God of your ancestors; for you cannot succeed.”

Contemporary English Version
That's why God is on our side and will lead us into battle when the priests sound the signal on the trumpets. It's no use, Israelites. You might as well give up. There's no way you can defeat the LORD, the God your ancestors worshiped.

New American Bible
See, God is with us, at our head, and his priests are here with trumpets to sound the attack against you. Israelites, do not fight against the LORD, the God of your ancestors, for you will not succeed!”

Douay-Rheims Bible
Therefore God is the leader in our army, and his priests who sound with trumpets, and resound against you: O children of Israel, fight not against the Lord the God of your fathers, for it is not good for you.

Therefore God is the leader in our army, and his priests who sound with trumpets, and resound against you: O children of Israel, fight not against the Lord the God of your fathers, for it is not good for you.

God

Numbers 23:21 There is no idol in Jacob, neither is there an image god to be seen in Israel. The Lord his God is with him, and the sound of the victory of the king in him.

1 Samuel 4:5-7 And when the ark of the covenant of the Lord was come into the camp, all Israel shouted with a great shout, and the earth rang again. . . .

Isaiah 8:10 Take counsel together, and it shall be defeated: speak a word, and it shall not be done: because God is with us.

Zechariah 10:5 And they shall be as mighty men, treading under foot the mire of the ways in battle: and they shall fight, because the Lord is with them, and the riders of horses shall be confounded.

Romans 8:31 What shall we then say to these things? If God be for us, who is against us?

for our captain

Deuteronomy 20:4 Because the Lord your God is in the midst of you, and will fight for you against your enemies, to deliver you from danger.

Joshua 5:13-15 And when Joshua was in the field of the city of Jericho, he lifted up his eyes, and saw a man standing over against him, holding a drawn sword, and he went to him, and said: Art thou one of ours, or of our adversaries? . . .

Psalm 20:7 Some trust in chariots, and some in horses: but we will call upon the name of the Lord, our God.

Hebrews 2:10 For it became him for whom are all things and by whom are all things, who had brought many children into glory, to perfect the author of their salvation, by his passion.

his priests

Numbers 10:8,9 And the sons of Aaron the priest shall sound the trumpets: and this shall be an ordinance for ever in your generations. . . .

Numbers 31:6 And Moses sent them with Phinees the son of Eleazar the priest, and he delivered to him the holy vessels, and the trumpets to sound.

Joshua 6:13-20 And seven of them seven trumpets, which are used in the jubilee: and they went before the ark of the Lord, walking and sounding the trumpets: and the armed men went before them, and the rest of the common people followed the ark, and they blew the trumpets. . . .

fight ye

Job 15:25,26 For he hath stretched out his hand against God, and hath strengthened himself against the Almighty. . . .

Job 40:9 And hast thou an arm like God, and canst thou thunder with a voice like him?

Isaiah 45:9 Woe to him that gainsayeth his maker, a sherd of the earthen pots: shall the clay say to him that fashioneth it: What art thou making, and thy work is without hands?

Jeremiah 50:24 I have caused thee to fall into a snare, and thou art taken, O Babylon, and thou wast not aware of it: thou art found and caught, because thou hast provoked the Lord.

Acts 5:39 But if it be of God, you cannot overthrow it, lest perhaps you be found even to fight against God. And they consented to him.

Acts 9:4,5 And falling on the ground, he heard a voice saying to him: Saul, Saul, why persecutest thou me? . . .

ye shall not

2 Chronicles 24:20 The spirit of God then came upon Zacharias the son of Joiada the priest, and he stood in the sight of the people, and said to them: Thus saith the Lord God: Why transgress you the commandment of the Lord which will not be for your good, and have forsaken the Lord, to make him forsake you?

Numbers 14:41 And Moses said to them: Why transgress you the word of the Lord, which shall not succeed prosperously with you?

Deuteronomy 28:29 And mayst thou grope at midday as the blind is wont to grope in the dark, and not make straight thy ways. And mayst thou at all times suffer wrong, and be oppressed with violence, and mayst thou have no one to deliver thee.

Job 9:4 He is wise in heart, and mighty in strength: who hath resisted him, and hath had peace?

Isaiah 54:17 No weapon that is formed against thee shall prosper: and every tongue that resisteth thee in judgment, thou shalt condemn. This is the inheritance of the servants of the Lord, and their justice with me, saith the Lord.

Jeremiah 2:37 For from thence thou shalt go, and thy hand shall be upon thy head: for the Lord hath destroyed thy trust, and thou shalt have nothing prosperous therein.

Ezekiel 17:9 Say thou: Thus saith the Lord God: Shall it prosper then? shall he not pull up the roots thereof, and strip off its fruit, and dry up all the branches it hath shot forth, and make it wither: and this without a strong arm, or many people to pluck it up by the root?