KJV : Understand <03045> (8804) therefore this day <03117>, that the LORD <03068> thy God <0430> [is] he which goeth over <05674> (8802) before <06440> thee; [as] a consuming <0398> (8802) fire <0784> he shall destroy <08045> (8686) them, and he shall bring them down <03665> (8686) before thy face <06440>: so shalt thou drive them out <03423> (8689), and destroy <06> (8689) them quickly <04118>, as the LORD <03068> hath said <01696> (8765) unto thee.
NASB : "Know therefore today that it is the LORD your God who is crossing over before you as a consuming fire. He will destroy them and He will subdue them before you, so that you may drive them out and destroy them quickly, just as the LORD has spoken to you.
NASB# : "Know<3045> therefore today<3117> that it is the LORD<3068> your God<430> who is crossing<5674> over<5674> before<6440> you as a consuming<398> fire<784>. He will destroy<8045> them and He will subdue<3665> them before<6440> you, so that you may drive<3423> them out and destroy<6> them quickly<4118>, just<3512> as the LORD<3068> has spoken<1696> to you.