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21 And I commanded Joshua at that time, saying, Thine eyes have seen all that Yahweh your elohim hath done unto these two kings: so shall Yahweh do unto all the kingdoms whither thou passest.
22 Ye shall not fear them: for Yahweh your elohim he shall fight for you.
This comes under the same category of reflection as the statement of God to Moses that He had given Sihon into his hand. The words of Moses superficially construed, would seem to justify inaction and uncarefulness on the part of Joshua, because if God was to fight for Israel, what need of Israel fighting? so it might have been asked. But Joshua did not so understand them.
He took all necessary measures implied in the work assigned to him.
When Moses was dead, God addressed to Joshua these inspiring words:
"There shall not any man be able to stand before thee all the days of thy life. As I was with Moses, so will I be with thee. I will not fail thee nor forsake thee" (Joshua 1:5).
The Ways of Providence Ch 12
25 I pray thee, let me go over, and see the good land [ha'aretz hatovah] that is beyond Jordan [Yarden], that goodly mountain [fine hill country], and Lebanon [Levanon].
26 But Yahweh was wroth [angry] with me for your sakes, and would not hear me: and Yahweh said unto me, Let it suffice thee [Enough from thee]; speak no more unto Me of this matter.
Moses (the meekest man) had been able on previous occasions to entreaty Yahweh to reverse his decisions. But here was a finality ...speak no more!
This was no act of caprice on God's part but one charged with the greatest import. It was not only Moses the man who died on Pisgah, but (this being the fact of greatest importance) also Moses the Lawgiver, he who as mediator of the Law was so much the symbol and embodiment of it that his own name came to attach itself to it though it was in reality the Law of God Himself.
When he failed to take the people into the material Rest, so also, simultaneously, did the Law; and this (in allegory) taught that into the eternal Rest also, of which the Land was but a symbol, the Law was likewise incapable of taking men. Not, however, because it chanced that men robbed it of its power to do so because they failed to keep it; no, not for that reason, but rather because God decreed that it should not (as he decreed that Moses should not lead the people in) because the Law never possessed, and was never meant to possess, the power to do so in the first place.
Not Moses but Joshua was the appointed agent-not the Law, that is, but that scheme of salvation realized in him (Jesus) who bore the same name as his illustrious predecessor (Heb. Joshua, cf. Acts 7 : 45; Heb. 4 : 8).
Law and Grace Ch 12