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15 But thou shalt have a perfect [shleimah] and just [tzedek] weight, a perfect and just measure shalt thou have: that thy days [yamim] may be lengthened in the land [ ha'adamah]which Yahweh thy Elohim giveth thee.
16 For all that do such things, and all that do unrighteously, are an abomination [to'evah] unto Yahweh thy Elohim.
17 Remember what Amalek did unto thee by the way, when ye were come forth out of Egypt [Mitzrayim];
18 How he met thee by the way, and smote the hindmost [rear ranks] of thee, even all that were feeble behind thee, when thou wast faint and weary; and he feared not Elohim.
19 Therefore it shall be, when Yahweh thy Elohim hath given thee rest from all thine enemies round about, in the land [ha'aretz] which Yahweh thy Elohim giveth thee for an inheritance [nachalah] to possess it, that thou shalt blot out the remembrance of Amalek from under heaven [Shomayim]; thou shalt not forget it.
The significance of God's quarrel with Amalek was for all time - "Write this for a memorial in a book"; but its effect would be the obliteration of Amalek as such: - 'Thou shalt blot out the remembrance of Amalek from under heaven".
It was a poor Israelite who failed to see more than the obvious literal meaning in this contrast and missed the symbolical sense of the term "Amalek". The Law here, if only he could see it, was presenting a challenge to him to wage a relentless war against sin in himself and all about him, a war so relentless that sin would in the process be annihilated.
Moses certainly construed the situation in that way. Ranging himself symbolically on the side of God in the strife against sin, and declaring his faith in its ultimate defeat, he built an altar, "and called the name of it Yahweh-nissi" (i.e. The Lord my banner).
He perceived in the recent repulse of Amalek an earnest of the eventual destruction of sin itself, and added in explanation of the name which he had given to the altar, "Because the Lord hath sworn that the Lord will have war with Amalek from generation to generation".
Our own experience is proof that this is indeed so, for the Spirit is in perpetual conflict with the flesh, these being "contrary the one to the other".
Law and Grace Ch 3