לְק֨וֹל תִּתּ֜וֹ הֲמ֥וֹן מַ֙יִם֙ בַּשָּׁמַ֔יִם וַיַּעֲלֶ֥ה נְשִׂאִ֖ים מִקְצֵ֣ה ארץ [הָאָ֑רֶץ] בְּרָקִ֤ים לַמָּטָר֙ עָשָׂ֔ה וַיּ֥וֹצֵא ר֖וּחַ מֵאֹצְרֹתָֽיו׃
A su voz se da muchedumbre de aguas en el cielo, y hace subir las nubes de lo postrero de la tierra; hace los relámpagos con la lluvia, y saca el viento de sus depósitos.
Shadal
"Let there be a firmament:" The Holy One, blessed be He, wanted to inform Israel that neither the sun nor anything else controls the rain, to bring it down or not to bring it down. Therefore, He told about the existence of the higher waters before the existence of the luminaries. "Firmament (rakiya):" [It is] a body that stretches out like a plate, [as in] the expression, "To the One that stretches out (rokea) the earth over the waters" (Psalms 136:6); "And they flattened (yiraka'au) the gold [into thin plates]" (Exodus 39:3); and [also] "And over the heads of the living creatures there was the likeness of a firmament, like the color of the terrible ice" (Ezekiel 1:22). And here it portrayed the air between the earth and the clouds as a body that extends and separates between the waters on earth and the waters in the clouds, and carries the waters upon it; and by the will of God, the water descends from there to the earth. And it is like it states (Deuteronomy 28:12), "And God will open for you His good storehouse, the heavens, to give the rain of your land in its time;" and in the Curse, when it states (Leviticus 26:19), "And I will give your skies to be like iron," to prevent the descent of water upon them; and so [too] below (Genesis 7:11), "and the windows of the heavens opened." But afterwards, in the time of Yishiyahu, it appears that they knew that there are no storehouses of water above, and that rain waters return above; since behold, he says (Isaiah 55:10), "For just as the rain and the snow come down from the skies, and do not return there except when the earth is satiated;" [which] implies that after it is satiated, it does return to there, see my commentary there. And so [too], Yirmiyahu said in the way of a question, "do the heavens give raindrops?" (Jeremiah 14:22); [which] implies that [the heavens] do not give them by themselves, since they do not have storehouses of water in them. And so [too], they called the vapors that rise up from upon the earth [and become clouds] the name, nissi'im (raised up ones), as [in], "He raises nissi'im from the end of the earth" (Psalms 135:7); "He raised the nissi'im from the end of the earth" (Jeremiah 10:13; 51:16); and so [too], "Nissi'im and wind, but no rain" (Proverbs 25:14). And we do not know from what time this word (nissi'im) became common; as Psalm 135 is not attributed to David and it is not clear that the Book of Proverbs from Chapter 25 is by Shlomo. And in Job, he says (Job 38:22), "Did you come to the storehouses of snow, did you see the storehouses of hail?" - and this is a proof of the antiquity of that book. And since the word, rakiya, is based on the belief in higher waters - "the waters that are above the heavens" (Psalms 148:4) - that the rakiya supports, and that belief became antiquated and forgotten; the word, rakiya, also became antiquated. And [rakiya] is only used to indicate the skies in three [other] places. Two are in Psalms - "and the acts of your hands, does the rakiya proclaim" (Psalms 19:2); "praise Him in the rakiya of His strength" (Psalms 150:1) - since the word remained in poetic use; as it is the custom in all languages for the poets to use antiquated words. And the third place is in Daniel 12:3, "And the enlightened ones will shine like the splendor of the rakiya;" and there also, it is a poetic expression. And so [likewise], in Malachi 3:10, "I will open for you the windows of the heavens," is by way of poetic expression. And we have also found a variant of rakiya referring to the heavens in Job 37:18, "Tarkiya (Did you spread out) the skies with Him;" and this too is a sign of the antiquity of this book. And he finishes [this verse], "they are as strong as a molten mirror," as they carry the weight of many waters. And so [too] did Shlomo say (Proverbs 8:28), "And in His strengthening of the skies above." And behold, the Torah spoke as in the language of people, and stated, "let there be a firmament," according to their thought (that it actually existed). And nonetheless, what was intended does not deviate from being true and solid, and that is that God implanted in the nature of water to rise upwards and to descend afterwards down to the earth. And in the Greek translation attributed to the seventy elders (the Septuagint), rakiya is translated as strauma, [which] is a matter of strength, and so [too] did they translate it afterwords into Latin [as] firmāmenta and this came to them from the use of the root, raka, in Syriac, which denotes strength; and so [too], rakiya in Syriac is strong and hard. And Johannes Clericus says that they translated it thus, because it was the opinion of some of the ancient philosophers that the heavens and air that surround the earth on all sides, prevent it and everything on it from getting detached and crumbling apart; and behold, they cause the earth to stay hard and its parts to remain fastened together. And he explains the expression to be one of hitting and trampling, as in "hit with your hand and stamp (reka) with your foot" (Ezekiel 6:11); "because you hit with your hand and you stamped (rakacha) with your foot" (Ezekiel 25:6); because the heavens are stamping on the earth and stopping its parts from detaching. And all of this is far from the simple meaning of the verses. And nonetheless, [his] words, that the origin of the root, raka, is from stomping and hitting, are plausible. And because something that is hit [becomes] flat and stretched out, the root, raka, is borrowed to indicate stretching out and flatness.
Sforno
"And G-d made the firmament" - and it was that when some of the elemental water was removed from under that part of the waters which became vaporous in nature, as it was when He said, "let the waters be gathered from beneath the heavens" Genesis 1:9, it was fit that the vaporous part would descend to that same place from which the that [non-vaporous portion of] waters was removed. But He made it such that that "firmament" that separates would have the power to stop and prevent the vaporous portion from descending - that's the "waters which are above the firmament", such that the transformed atmospheric portion would descend, while the vaporous would remain in its original place. Because of this, when the moist vapor reaches it [i.e., the firmament], it condenses and gives rise to rain, snow and hail. As they condense they descend, as it is said, "at the sound of His placing an abundance of water in the heavens" Jeremiah 10:13. - what it wanted by saying "heavens": the firmament which condenses the atmospheric part [of the waters], as it is said "And G-d called the firmament "heavens" Genesis 1:8. Now when the cloudy, excited vapor arrives there [at the firmament], it generates thunder and lightning, and it is said: "He lifts up clouds from the ends of the earth, thunder from the rain He makes" [continuation of verse quoted previously from Jeremiah]. Now, seeing as how some of the heavier watery element is above the lighter air, which from our perspectives is against their nature - this without doubt indicates the action of an volitional actor, intended such an outcome, as it is said, "the work of His hands shall the firmament declare" Psalms 19:2
Rashi
To steeds in the chariots of Pharaoh I have likened you, my beloved. This lamed is like the lamed of, “At the sound לְקוֹל of His giving an abundance of water,”37Yirmiyahu 10:13. and as in, “like the fragrance לְרֵיחַ of your good oils.”38Above 1:3. לְסֻסָתִי=] at the gathering of many steeds, for I gathered My camps to go out toward you against the chariots of Pharaoh to save you, as it is stated, “You trampled [them] in the sea with your steeds,”39Chavakuk 3:15. i.e., many steeds. There I silenced you [=דִּמִּיתִיךְ, My beloved; I silenced you from your cry, as it is stated, “and you shall remain silent.”40Shemos 14:14. I saw this in Aggadic works. Another explanation—I have likened you my beloved. There I demonstrated [=דִּמִּיתִיךְ to all that you are My beloved.