2 And when the Lord thy God shall deliver them before thee; thou shalt smite them, and utterly destroy them; thou shalt make no covenant with them, nor shew mercy unto them:
English Standard Version
2 and when the Lord your God gives them over to you, and you defeat them, then you must devote them to complete destruction.That is, set apart (devote) as an offering to the Lord (for destruction) You shall make no covenant with them and show no mercy to them.
2 God, your God, will turn them over to you and you will conquer them. You must completely destroy them, offering them up as a holy destruction to God. Don't make a treaty with them. Don't let them off in any way.
New King James Version
2 and when the Lord your God delivers them over to you, you shall conquer them and utterly destroy them. You shall make no covenant with them nor show mercy to them.
New Living Translation
2 When the Lord your God hands these nations over to you and you conquer them, you must completely destroy them. Make no treaties with them and show them no mercy.
Here is a strict caution against all friendship and fellowship with idols and idolaters. Those who are in communion with God, must have no communication with the unfruitful works of darkness. Limiting the orders to destroy, to the nations here mentioned, plainly shows that after ages were not to draw this into a precedent. A proper understanding of the evil of sin, and of the mystery of a crucified Saviour, will enable us to perceive the justice of God in all his punishments, temporal and eternal. We must deal decidedly with our lusts that war against our souls; let us not show them any mercy, but mortify, and crucify, and utterly destroy them. Thousands in the world that now is, have been undone by ungodly marriages; for there is more likelihood that the good will be perverted, than that the bad will be converted. Those who, in choosing yoke-fellows, keep not within the bounds of a profession of religion, cannot promise themselves helps meet for them.