Exodus 15:1

אז ישיר משה THEN SANG MOSES — with regard to the usage of the future ישיר, the meaning is: THEN — i. e. when he saw the miracle it entered his mind that HE WOULD SING a song. Similar is, (Joshua 10:12) “Then Joshua would speak (אז ידבר)”; and similar, (1 Kings 7:8) “and a house he would make (יעשה) for Pharaoh’s daughter”, which signifies “he purposed in his heart that he would make it for her”. So, also, ישיר here signifies: his heart told him that he should sing, and thus did he actually do, as it states, “and they (Moses and Israel) spake as follows, ‘I will sing unto the Lord’”. And in the same way, in the case of Joshua, it means: then (או) — when he saw the miracle mentioned in that narrative — his heart told him (prompted him) to speak, and thus did he actually do, as it is stated, “and he spake before the eyes of all Israel”. The same applies to the Song of the Well (Numbers 21:17) which begins with the words: אז ישיר ישראל, “then would Israel sing”; it expresses the intention quite plainly in the following words, “Come up, O Well — sing ye unto it” (i. e. these words are a call to the people to sing to it after Israel had expressed their intention so to do and are not part of the song itself which begins with the words that follow). With regard to (1 Kings 11:7) אז יבנה שלמה במה our Rabbis explained that He proposed to build a high place for Chemosh but actually did not build it (Sanhedrin 91b). This, too, teaches us that the י as a prefix of the imperfect is used in reference to intention to do a thing. This explanation serves to settle the literal meaning of the text. But so far as its Midrashic explanation is concerned our Rabbis, of blessed memory, said: from here (i. e. from the fact that the future tense is used) we may derive an intimation that the tenet of the Resurrection of the Dead is from the Torah (is alluded to, although only by inference, in the Torah) (Sanhedrin 91b). And thus, also, do they explain in the case of all them (all of the examples quoted) except in the case of that referring to Solomon which they explained in the sense that he purposed to build a high place but did not build it. — One cannot say that this can be appropriately explained in the same way as one explains other passages which are written in the future tense, but which really refer to an immediate action (i. e. to a then present time); for example, (Job. 1:5) “Thus was Job doing (יעשה)”; (Numbers 9:18) “At the command of the Lord were they encamping (יחנו)”; (Numbers 9:20) “And there were occasions when the cloud was (יהיה) upon the tabernacle”, because these were each of them something that was continuously happening, and there is proper to it either the future tense or the past tense (cf. Rashi on Genesis 29:3). But this (אז ישיר and other passages quoted) which happened only at the particular moment mentioned (once and once only), one cannot fittingly explain in this sense (i. e. of continuous action). כי גאה גאה FOR HE IS GLORIOUSLY SUBLIME — render this as the Targum does: for He is exalted above all exalted beings and real exaltation (supremity) is His alone. [Another explanation: the repetition of the word is intended to state that He has done something which it is impossible for a human being (lit., flesh and blood) to do. When he (the latter) fights against another and vanquishes him he throws him off the horse, but here — horse and its rider together hath He hurled into the sea. The usage is, that in the case of everything which cannot possibly be done by anyone except Him the appropriate expression to use is a form of the root גאה, as in (Isaiah 12:5), “for He hath done גאות” — gloriously. In the same way you will find that throughout the whole Song the words are repeated: (v. 2) “The strength and vengeance of the Lord have become my help”; (v. 4). “The Lord is a man of war, the Lord is His name” (cf. Rashi’s explanation of this), and this is the case in all the verses]. Another explanation of כי גאה גאה: I will sing unto the Lord although (כי) He is exalted high above all songs and however much I may praise Him there will still remain something additional in Him to be praised (עוד יש בו תוספת — I can never exhaust his praises), and not as is the practice in respect to a human king whom one praises, attributing to him certain virtues whilst these are really not in him (cf. Mekhilta). סוס ורכבו THE HORSE AND ITS RIDER — both of them attached one to the other; and the waters lifted them up and then they descended into the depths and yet they did not become separated (Mekhilta). רמה means HE HATH CAST. Similar is (Daniel 3:21) “and they were cast (ורמיו) into the midst of the fiery furnace”. And an Agadic explanation is: One verse says רמה, which involves the idea of raising (רום), and another verse (v. 4) says, ירה which implies casting from a height (cf. Rashi on ירה יירה 19:13)! This teaches us that they first went up on high and then went down into the depths (i. e. they were tossed up and down). The meaning of ירה here is the same as in (Job. 38:6) “Who laid (ירה) the corner-stone thereof?” — implying laying from above to below (Mekhilta).

אָ֣ז יָשִֽׁיר־מֹשֶׁה֩ וּבְנֵ֨י יִשְׂרָאֵ֜ל אֶת־הַשִּׁירָ֤ה הַזֹּאת֙ לַֽיהֹוָ֔ה וַיֹּאמְר֖וּ לֵאמֹ֑ר        אָשִׁ֤ירָה לַֽיהֹוָה֙ כִּֽי־גָאֹ֣ה גָּאָ֔ה        ס֥וּס וְרֹכְב֖וֹ רָמָ֥ה בַיָּֽם׃        

Then sang Moshe and the children of Yisra᾽el this song to the Lord, and spoke, saying, I will sing to the Lord, for he has triumphed gloriously: the horse and his rider has he thrown into the sea.