Midrasch zu Bamidbar 10:9

Rabbi Yitzḥak began: “Because you did not serve the Lord your God with joy and with gladness of heart, due to abundance of everything, you will serve your enemies…” (Deuteronomy 28:47–48) – had you been worthy, you would have read in the Torah: “You will bring them and plant them in the mountain of Your inheritance” (Exodus 15:17), but now that you are not worthy, you read: “Let all their evil come before You [and do to them as You did to me]” (Lamentations 1:22).³³The term “You will bring them” in the verse in Exodus and the word “come” in the verse in Lamentations have the same root: tav, bet, alef.
Had you been worthy, you would have read in the Torah: “Peoples heard, they were agitated” (Exodus 15:14), but now that you are not worthy, you read: “They heard that I am sighing” (Lamentations 1:21).
Had you been worthy, you would have read in the Torah: “I have seen the affliction of My people that is in Egypt” (Exodus 3:7), but now that you are not worthy, you read: “See, Lord, for I am in distress, my innards burn” (Lamentations 1:20).
Had you been worthy, you would have read in the Torah: “You shall proclaim on this very day” (Leviticus 23:21), but now that you are not worthy, you read: “I called my lovers; [they deceived me]” (Lamentations 1:19).³⁴The word “proclaim” in Leviticus and the word “called” in Lamentations have the same root: kuf, resh, alef.
Had you been worthy, you would have read in the Torah: “Justice [tzedek], justice you shall pursue” (Deuteronomy 16:20), but now that you are not worthy, you read: “The Lord is righteous [tzadik], for I have defied His word” (Lamentations 1:18).
Had you been worthy, you would have read in the Torah: “You shall open your hand [to your brother]” (Deuteronomy 15:11), but now that you are not worthy, you read: “Zion spread its hands, [there is no comforter for it]” (Lamentations 1:17).
Had you been worthy, you would have read in the Torah: “These are the appointed times of the Lord” (Leviticus 23:4), but now that you are not worthy, you read: “For these I weep” (Lamentations 1:16).
Had you been worthy, you would have read in the Torah: “We will ascend on the highway [bamsila]” (Numbers 20:19), but now that you are not worthy, you read: “The Lord trampled [sila] all my mighty” (Lamentations 1:15).
Had you been worthy, you would have read in the Torah: “I broke the bars of your yoke” (Leviticus 26:13), but now that you are not worthy, you read: “The yoke of my transgressions is preserved in His hand” (Lamentations 1:14).
Had you been worthy, you would have read in the Torah: “A perpetual fire shall burn upon the altar” (Leviticus 6:6), but now that you are not worthy, you read: “From on high He sent fire into my bones” (Lamentations 1:13).
Had you been worthy, you would have read in the Torah: “[The Lord your God who goes before you, He shall fight for you according to all that He did for you.…] in the entire path [derekh] that you went” (Deuteronomy 1:30–31), but now that you are not worthy, you read: “May it not befall you, all passersby [ovrei derekh]” (Lamentations 1:12).
Had you been worthy, you would have read in the Torah: “You will eat your bread to satiation” (Leviticus 26:5), but now that you are not worthy, you read: “All its people are sighing, seeking bread” (Lamentations 1:11).
Had you been worthy, you would have read in the Torah: “No man will covet your land” (Exodus 34:24), but now that you are not worthy, you read: “The besieger spread his hand over all its delights” (Lamentations 1:10).
Had you been worthy, you would have read in the Torah: “For on this day he shall atone for you [to purify you]” (Leviticus 16:30), but now that you are not worthy, you read: “Its impurity is on its skirts” (Lamentations 1:9).
Had you been worthy, you would have read in the Torah: “From all your sins you shall be purified before the Lord” (Leviticus 16:30), but now that you are not worthy, you read: “Jerusalem has sinned” (Lamentations 1:8).
Had you been worthy, you would have read in the Torah: “You shall be remembered before the Lord your God” (Numbers 10:9), but now that you are not worthy, you read: “Jerusalem remembered in the days of its affliction” (Lamentations 1:7).
Had you been worthy, you would have read in the Torah: “I will walk in your midst” (Leviticus 26:12), but now that you are not worthy, you read: “All the glory of the daughter of Zion has gone” (Lamentations 1:6).
Had you been worthy, you would have read in the Torah: “The Lord will place you as a head [lerosh]” (Deuteronomy 28:13), but now that you are not worthy, you read: “Its foes are ascendant [lerosh], its enemies are tranquil” (Lamentations 1:5).
Had you been worthy, you would have read in the Torah: “Three times a year [shall all your males appear before the Lord your God…on the festival]” (Deuteronomy 16:16), but now that you are not worthy, you read: “The ways of Zion mourn [without festival pilgrims]” (Lamentations 1:4).
Had you been worthy, you would have read in the Torah: “You will dwell securely” (Leviticus 26:5), but now that you are not worthy, you read: “Judah has been exiled in affliction” (Lamentations 1:3).
Had you been worthy, you would have read in the Torah: “It is a night of watching of the Lord” (Exodus 12:42), but now that you are not worthy, you read: “It weeps at night” (Lamentations 1:2).
Had you been worthy, you would have read in the Torah: “How [eikha] can I bear alone” (Deuteronomy 1:12), but now that you are not worthy, you read: “How [eikha] does…sit solitary?” (Lamentations 1:1).

(Bamidbar 10:9) "And if you go to war in your land": whether you go out against them or they come against you. Does this speak of the foe that assails you in the war of Gog and Magog or of wars in general? It is written (Ibid.) "and you will be saved from your enemies." Go out and see: In which war is Israel saved without subjugation to follow? In the war of Gog and Magog, as it is written (Zechariah 14:3, 9) "And the L-rd will go out and wage war against those nations … And the L-rd will be King over all the land." R. Akiva says: This ("then you shall sound the trumpets") tells me only of war. Whence do I derive (the same for) blast, mildew, difficult labors, and tempest-tossed vessels? From (Bamidbar, Ibid.) "against the oppressor that oppresses you" — against any "oppression" that may befall the people. "then you shall sound the trumpets and you will be remembered before the L-rd your G-d." R. Akiva says: Now do the trumpets cause remembrance (before the L-rd)? The intent is that if they were in a position to blow (the trumpets) but failed to do so, it is reckoned to them as if they were not remembered before the L-rd. "and you will be remembered … and you will be saved." Whenever Israel is "remembered," it is remembered only for salvation.