New Revised Standard Version
Know then today that the LORD your God is the one who crosses over before you as a devouring fire; he will defeat them and subdue them before you, so that you may dispossess and destroy them quickly, as the LORD has promised you.

Contemporary English Version
But the LORD your God has promised to go ahead of you, like a raging fire burning everything in its path. So when you attack your enemies, it will be easy for you to destroy them and take their land.

New American Bible
Know, then, today that it is the LORD, your God, who will cross over before you as a consuming fire; he it is who will destroy them and subdue them before you, so that you can dispossess and remove them quickly, as the LORD promised you.

Douay-Rheims Bible
Thou shalt know therefore this day that the Lord thy God himself will pass over before thee, a devouring and consuming fire, to destroy and extirpate and bring them to nothing before thy face quickly, as he hath spoken to thee.

Thou shalt know therefore this day that the Lord thy God himself will pass over before thee, a devouring and consuming fire, to destroy and extirpate and bring them to nothing before thy face quickly, as he hath spoken to thee.

Understand

Deuteronomy 9:6 Know therefore that the Lord thy God giveth thee not this excellent land in possession for thy justices, for thou art a very stiffnecked people.

Matthew 15:10 And having called together the multitudes unto him, he said to them: Hear ye and understand.

Mark 7:14 And calling again the multitude unto him, he said to them: Hear ye me all and understand.

Ephesians 5:17 Wherefore, become not unwise: but understanding what is the will of God.

goeth over

Deuteronomy 1:30 The Lord God, who is your leader, himself will fight for you, as he did in Egypt in the sight of all.

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.

Deuteronomy 31:3-6 The Lord thy God then will pass over before thee: he will destroy all these nations in thy sight, and thou shalt possess them: and this Josue shall go over before thee, as the Lord hath spoken. . . .

Joshua 3:11,14 Behold, the ark of the covenant of the Lord of all the earth shall go before you into the Jordan. . . .

Micah 2:13 I will assemble and gather together all of thee, O Jacob: I will bring together the remnant of Israel, I will put them together as a flock in the fold, as sheep in the midst of the sheepcotes, they shall make a tumult by reason of the multitude of men.

Revelation 19:11-16 And I saw heaven opened: and behold a white horse. And he that sat upon him was called faithful and true: and with justice doth he judge and fight. . . .

a consuming fire

Deuteronomy 4:24 Because the Lord thy God is a consuming fire, a jealous God.

Isaiah 27:4 There is no indignation in me: who shall make me a thorn and a brier in battle: shall I march against it, shall, I set it on fire together?

Isaiah 30:27,30,33 Behold the name of the Lord cometh from afar, his wrath burneth, and is heavy to bear: his lips are filled with indignation, and his tongue as a devouring fire. . . .

Isaiah 33:14 The sinners in Sion are afraid, trembling hath seized upon the hypocrites. Which of you can dwell with devouring fire? which of you shall dwell with everlasting burnings?

Nahum 1:5,6 The mountains tremble at him, and the hills are made desolate: and the earth hath quaked at his presence, and the world, and all that dwell therein. . . .

2 Thessalonians 1:8 In a flame of fire, giving vengeance to them who know not God and who obey not the gospel of our Lord Jesus Christ.

Hebrews 12:29 For our God is a consuming fire.

he shall

Deuteronomy 7:1,2,16,23,24 When the Lord thy God shall have brought thee into the land, which thou art going in to possess, and shall have destroyed many nations before thee, the Hethite, and the Gergezite, and the Amorrhite, and the Chanaanite, and the Pherezite, and the Hevite, and the Jebusite, seven nations much more numerous than thou art, and stronger than thou: . . .

Exodus 23:29-31 I will not cast them out from thy face in one year; lest the land be brought into a wilderness, and the beasts multiply against thee. . . .

Isaiah 41:10-16 Fear not, for I am with thee: turn not aside, for I am thy God: I have strengthened thee, and have helped thee, and the right hand of my just one hath upheld thee. . . .

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