כֵּ֣ן יִֽהְיֶ֤ה דְבָרִי֙ אֲשֶׁ֣ר יֵצֵ֣א מִפִּ֔י לֹֽא־יָשׁ֥וּב אֵלַ֖י רֵיקָ֑ם כִּ֤י אִם־עָשָׂה֙ אֶת־אֲשֶׁ֣ר חָפַ֔צְתִּי וְהִצְלִ֖יחַ אֲשֶׁ֥ר שְׁלַחְתִּֽיו׃
Так будет и слово Мое, исходящее из уст Моих: оно не вернется ко Мне пустым, если оно не исполнит того, что мне угодно, и сделает то, ради чего Я послал, его процветание.
Ibn Ezra
the word downpours [Hebrew: revivim] (both words are adjectives) comes from the Hebrew word for “abundant” [Hebrew: rav], since the word vegetation generally denotes a stronger kind of plant than the word grass. Some say that the word showers comes from the word “hair”. Others have related it to “the storm wind of God ” [Jeremiah 23: 19], albeit the former is spelled with a s̀in whereas the latter is spelled with a samekh (similarly, “shall come against him like a storm” [Daniel 11: 40], is spelled with a s̀in, although its meaning is identical to the same word spelled with a samakh). It is also possible that the word simply has no cognate in Scripture. Employing the customary prophetic style, Scripture expresses the same idea twice, for emphasis, the idea being that Moshe prays for his words to fall like dew and rain. Dew and rain do not descend without effect; they never fall without, as it is written, “watering the earth” [Isaiah 55: 10]. The idea is that Moshe’s words should enter the hearts of his audience in the same way that rain and dew enter the earth, causing it to bear life, and to flourish.
Rav Hirsch
מוצא פי ה׳ (vergl. Jes. 55, 11). כן יהיה דברי אשר יצא מפי, wo damit jede von Gott ausgehende Bestimmung bezeichnet wird. So heißt auch beim Menschen das Wort, das, sei es als Gelübde, oder als Wunsch, Tat werden soll: מוצא שפתיו. Dewarim 23, 24 und Jirmija 17, 16). So auch von Gott die über die Davidische Dynastie ausgesprochene Bestimmung: ומוצא שפתי לא אשנה (Ps. 89, 35).
Ramban
KNOW THEREFORE from the [circumstances of the] departure from Egypt THAT THE ETERNAL THY G-D, HE IS G-D Who created heaven and earth, as I have explained.342Above, 6:20. And know furthermore from this that He is THE FAITHFUL G-D Whose word shall not return void,343See Isaiah 55:11. and WHO KEEPETH THE COVENANT AND MERCY WITH THEM THAT LOVE HIM, AND KEEP HIS COMMANDMENTS, who fear His Name, TO A THOUSAND GENERATIONS of their seed, just as He kept for you the covenant of your fathers. And know further that He repayeth them that hate Him344Verse 10. the recompense of their wickedness to the face of each one of them to destroy them, just as He destroyed the Egyptians and did not delay [in bringing punishment] to them. Now this attribute that he mentioned is true forever. Thus although there is a wicked man that prolongeth his life in his evil-doing,345Ecclesiastes 7:15. it happens to him only because of this above-mentioned attribute that He is the Keeper of Mercy, and he [the wicked] has done some good which must be recompensed. If so, there are among the attributes of the Holy One, blessed be He, but two ways [of dealing with people]: He repays good for good, and evil for evil.
It is possible that those that hate Him [mentioned here as destined to be destroyed without delay] are those confirmed sinners who deny His existence and have no merit at all. As the Rabbis have said:346Koheleth Rabbah 7:32. “Rabbi Yashiyah said: Because of three things the Holy One, blessed be He, is long-suffering to the wicked in this world: they may repent, or they have observed commandments for which the Holy One, blessed be He, repays them their recompense in this world, or perhaps righteous people will descend from them. For so we find that He was long-suffering with Ahaz,347A wicked king of Judah (II Kings 16:1-5). and Hezekiah came from him; so also to Amon,348Ibid., 21:19-22. and Josiah came from him; and so also to Shimei,349The son of Gera, the Benjamite who cursed David (I Kings 2:8). and Mordecai came from him.”350Esther 2:5. Thus all these [three above categories] are not included in [the term] those that hate Him. Now there is a secret in the expression ‘el panav’ (to his face) [And He repayeth ‘them’ that hate Him ‘el panav’ — “to his face”]351The point is that since the verse begins with the plural [‘those’ that hate Him], why does it change to the singular [to ‘his’ face, to destroy ‘him’]? Ramban alludes to the secret of the transmigration of the soul, so that at some future generation the recompense is still to “the face” of the sinner after he has been rewarded for the good he has done (Abusaula). as applying to a wicked man who has a good [i.e., a happy and prosperous] life.352Berachoth 7 a. And then he returns to say, Thou shalt therefore keep the commandment etc.,353Verse 11. meaning: “therefore keep the commandment, and the statutes, and the ordinances so that you should not be among those who hate Him, who are destroyed, but instead you should be of those that love Him and keep His commandments354Verse 9. who are remembered for good and for life.”
Eikev
It is possible that those that hate Him [mentioned here as destined to be destroyed without delay] are those confirmed sinners who deny His existence and have no merit at all. As the Rabbis have said:346Koheleth Rabbah 7:32. “Rabbi Yashiyah said: Because of three things the Holy One, blessed be He, is long-suffering to the wicked in this world: they may repent, or they have observed commandments for which the Holy One, blessed be He, repays them their recompense in this world, or perhaps righteous people will descend from them. For so we find that He was long-suffering with Ahaz,347A wicked king of Judah (II Kings 16:1-5). and Hezekiah came from him; so also to Amon,348Ibid., 21:19-22. and Josiah came from him; and so also to Shimei,349The son of Gera, the Benjamite who cursed David (I Kings 2:8). and Mordecai came from him.”350Esther 2:5. Thus all these [three above categories] are not included in [the term] those that hate Him. Now there is a secret in the expression ‘el panav’ (to his face) [And He repayeth ‘them’ that hate Him ‘el panav’ — “to his face”]351The point is that since the verse begins with the plural [‘those’ that hate Him], why does it change to the singular [to ‘his’ face, to destroy ‘him’]? Ramban alludes to the secret of the transmigration of the soul, so that at some future generation the recompense is still to “the face” of the sinner after he has been rewarded for the good he has done (Abusaula). as applying to a wicked man who has a good [i.e., a happy and prosperous] life.352Berachoth 7 a. And then he returns to say, Thou shalt therefore keep the commandment etc.,353Verse 11. meaning: “therefore keep the commandment, and the statutes, and the ordinances so that you should not be among those who hate Him, who are destroyed, but instead you should be of those that love Him and keep His commandments354Verse 9. who are remembered for good and for life.”
Eikev
Rashi
And it was so. Not that his kingdom deserved to last that long, but to fulfill the word of the King,9I.e., the word of God stated in 10:30 above. as it is stated, ”So shall be My word, which will go forth from My mouth etc.”10Yeshayohu 55:11.