The Lord therefore left all these nations, and would not quickly destroy them, neither did he deliver them into the hands of Josue.

So the LORD left those nations, not driving them out at once, and he did not give them into the power of Joshua.

Therefore the LORD left those nations, without driving them out speedily, neither did he deliver them into the hand of Joshua.

And Jehovah leaveth these nations, so as not to dispossess them hastily, and did not give them into the hand of Joshua.

So the Lord let those nations go on living in the land, not driving them out quickly, and did not give them up into the hands of Joshua.

Therefore, the Lord left all these nations, and he was not willing to quickly overthrow them, nor did he deliver them into the hands of Joshua.

Without driving them out hastily - Had God expelled all the ancient inhabitants at once, we plainly see, from the subsequent conduct of the people, that they would soon have abandoned his worship, and in their prosperity forgotten their deliverer. He drove out at first as many as were necessary in order to afford the people, as they were then, a sufficiency of room to settle in; as the tribes increased in population, they were to extend themselves to the uttermost of their assigned borders, and expel all the remaining inhabitants. On these accounts God did not expel the aboriginal inhabitants hastily or at once; and thus gave the Israelites time to increase; and by continuing the ancient inhabitants, prevented the land from running into waste, and the wild beasts from multiplying; both of which must have infallibly taken place had God driven out all the old inhabitants at once, before the Israelites were sufficiently numerous to occupy the whole of the land.
These observations are important, as they contain the reason why God did not expel the Canaanites. God gave the Israelites a grant of the whole land, and promised to drive out their enemies from before them if they continued faithful. While they continued faithful, God did continue to fulfill his promise; their borders were enlarged, and their enemies fled before them. When they rebelled against the Lord, he abandoned them, and their enemies prevailed against them. Of this, their frequent lapses and miscarriages, with God's repeated interpositions in their behalf, are ample evidence. One or two solitary instances might not be considered as sufficient proof; but by these numerous instances the fact is established. Each rebellion against God produced a consequent disaster in their affairs; each true humiliation was invariably followed by an especial Divine interposition in their behalf. These afforded continual proof of God's being, providence, and grace. The whole economy is wondrous; and its effects, impressive and convincing. The people were not hastily put in possession of the promised land, because of their infidelity. Can the infidels controvert this statement? If not then their argument against Divine revelation, from "the failure of positive promises and oaths," falls to the ground. They have not only in this, but in all other respects, lost all their props.
"Helpless and prostrate all their system lies
Cursing its fate, and, as it curses, dies."

Therefore the Lord left these nations, without driving them out hastily,.... Left them unsubdued, or suffered them to continue among the Israelites, and did not drive them out as he could have done; which was permitted, either that it might be seen and known whether Israel would give into the idolatry of these nations or not, Judges 2:22; of which there could have been no trial, if they and their idols had been utterly destroyed; or because the children of Israel had transgressed the covenant of the Lord, therefore he would drive no more of them out, but leave them to afflict and distress them, and thereby prove and try them, Judges 2:20; both senses may very well stand, but the former seems rather to agree with what follows:
neither delivered he them into the hand of Joshua; having an end to be answered by them, before suggested, namely, to prove and try Israel; and, for a like reason, the indwelling sin and corruptions of God's people are suffered to remain in them, for the trial of their graces, and that the power of God in the support and deliverance of them might appear the more manifest.

In consequence of this resolution, the Lord let these tribes (those mentioned in Judges 3:3) remain at rest, i.e., quietly, in the land, without exterminating them rapidly. The expression מהר, hastily, quickly, i.e., according to the distinct words of the following clause, through and under Joshua, appears strange after what has gone before. For what is threatened in Judges 2:21 is not the suspension of rapid extermination, but of any further extermination. This threat, therefore, is so far limited by the word "hastily," as to signify that the Lord would not exterminate any more of these nations so long as Israel persisted in its idolatry. But as soon as and whenever Israel returned to the Lord its God in true repentance, to keep His covenant, the Lord would recall His threat, and let the promised extermination of the Canaanites go forward again. Had Israel not forsaken the Lord its God so soon after Joshua's death, the Lord would have exterminated the Canaanites who were left in the land much sooner than He did, or have carried out their gradual extermination in a much shorter time than was actually the case, in consequence of the continual idolatry of the people.