As the LORD commanded his servant Moses, so Moses commanded Joshua, and Joshua did it; he left nothing undone of all that the LORD commanded Moses.
John Calvin... in accordance with the explanation already given, it is repeatedly and more clearly stated in this passage, that Joshua did not give loose reins to his passion, when he slew all from the least to the greatest. For there is now a distinct statement of what had not yet been expressed, namely, that Joshua faithfully performed his part, by fulfilling everything which the Lord had enjoined by Moses. It is just as if he had placed his hands at the disposal of God, when he destroyed those nations according to his command. And so ought we to hold that, though the whole world should condemn us, it is sufficient to free us from all blame, that we have the authority of God (Literally, That we have God as guarantee and author of what we do. Ed) Meanwhile, it becomes us prudently to consider what each man’s vocation requires, lest any one, by giving license to his zeal, as wishing to imitate Joshua, may be judged cruel and sanguinary, rather than a strict servant of God.