Midrash su Lamentazioni 5:5

“To our necks we have been pursued; we are exhausted, and we have no respite” (Lamentations 5:5).
“To our necks we have been pursued.” Hadrian, may his bones be crushed, commanded and said: ‘If we come and we find hair on a Jew, we will remove his head from him.’⁵Hadrian decreed that the Jews must have their heads shaved as a sign of degradation. Defying this decree was punishable by death. That is what is written: “To our necks we have been pursued.”
Another matter, “to our necks we have been pursued,” it is because we betrayed with our necks on a day of trouble. “We are exhausted, and we have no respite.” Nebuchadnezzar, may his bones be crushed, commanded Nevuzaradan and said to him: ‘The God of these accepts penitents, and His hand is outstretched to accept penitents. When you conquer them, do not allow them to pray, so they will not repent and their God will then have mercy on them, and this man⁶Nebuchadnezzar is referring to himself. will have his downfall with black face.⁷In shame. Do not underestimate them.’ When he conquered them, when one of them would stand, he would take him, dismember him, and cast him before them. They would be forced to walk against their will.⁸They were not permitted to stop walking. This is implied in the verse “we have no respite” (Etz Yosef). Rabbi Yehoshua ben Levi said: Nevuzaradan is Aryokh. Why is his name called Aryokh? It is because he would roar at the captives like a lion [arye] until they reached the Euphrates. When they reached the Euphrates, he said to his legions: ‘Allow them to rest, as from here on, their God will no longer return to them.’ That is what is written: “By the rivers of Babylon, there we sat and also wept” (Psalms 137:1). Until there, we did not sit.

... R’ Yitzchak expounded on, “On willows in its midst we hung our harps.” (Psalms 137:2) Come and see – the dirt of the land of Israel is for repentance. While they were still in the land of Israel, Jeremiah was saying to them ‘repent before the judgement is sealed upon you,’ and they did not accept his words. Once they were exiled, they kept themselves sanctified through the commandments, taking their harps and hanging them on the willows. “For there our captors asked us for words of song…” (Psalms 137:3) At that time the nations of the world said to them: stand up and sing before idols just as you would sing in the Holy Temple. They replied: if we had sung songs in our place, we would not have been exiles. And now how should we sing songs before idols?! R ‘ Yitzchak Tavlai would say: to what is this to be compared? To a king of flesh and blood who married the daughter of kings. He said to her: get up and bring me a cup to drink, and she did not want to serve him. He was angry with her and drove her from his house, and she went and married a man who was afflicted with boils. He said: get up and bring me a cup to drink. She said to him: worthless one! I was a daughter of kings, married to a king, and because he said ‘bring me a drink’ and I did not want to serve him he was angry with me and drove me from his home. In that case if I had served him I would have added to my honor and had honor in my place, and now you say to me get up and serve me?! So Israel says to the nations of the world: if we had sang songs before the Holy One in our place on all the miracles which He did for us, we would have stayed in our place and not been exiled from our land. Now we should sing songs before idols?! Immediately they arose and killed heaps and heaps of them, and even though many of them were killed Israel rejoiced that they did not sing songs before the idols, as it says “…and our tormentors [asked of us] mirth…” (ibid.) At that moment the Holy One swore a whole oath to Israel. He said of Himself, so to speak, if I do not keep my oath, as it says “If I forget you, O Jerusalem, may my right hand forget [its skill].” (Psalms 137:5) The Holy One took His hand and placed it behind Him at the moment when Israel was exiled, just as it says “He has withdrawn His right hand from the enemy…” (Lamentations 2:3) The Holy One, so to speak, did not return it to its place. And so too the Holy One said to Israel: I will forget My right hand which I placed behind Me if I do not fulfill my oath to you and not forget you among the nations. “May my tongue cling to my palate, if I do not remember you, if I do not bring up Jerusalem at the beginning of my joy.” (Psalms 137:6) In the future the Holy One will return to Jerusalem all of her joy, as it says “And the redeemed of Zion shall return, and they shall come to Zion with song, with joy of days of yore shall be upon their heads…” (Isaiah 35:10) And anyone who mourns for Jerusalem in this world will rejoice with her in the time to come, as it says “Rejoice with Jerusalem and exult in her all those who love her: rejoice with her a rejoicing, all who mourn over her.” (Isaiah 66:10) They said in the name of Abaye: joy only comes on the ninth of Av, because they mandated mourning then in this time and in the future the Holy One will make it into a holiday, as it says “…and I will turn their mourning into joy and will comfort them and make them rejoice from their sorrow.” (Jeremiah 31:12) ... “No one pitches my tent anymore, or sets up my curtains.” (Jeremiah 10:20) What is this, does it mean that the Holy Temple will not be rebuilt in the future?! No, rather it is saying that no one from among you will pitch my tent anymore nor anyone from among you shall set up my curtains. The First Temple, which was built by flesh and blood, fell at the hands of the enemy. But the final Sanctuary that will be built by the Holy One, as it says “The Lord is the builder of Jerusalem; He will gather the outcasts of Israel,” (Psalms 147:2) will not be destroyed. Therefore it says “My tent has been spoiled…” (Jeremiah 10:20)

... Teach us oh, teacher: once the Ninth of Av has ended, is everything permitted? R’ Chiyah the Great taught like this: once the Ninth of Av has ended, one is permitted to do anything. Why? Because it is like the case of a person whose dead is laid out before him, who is forbidden to eat meat or drink wine. Once the dead is buried, the mourner is permitted to do so. So to on the Ninth of Av one is a mourner – once the day has ended one is permitted to do anything. Even though we are permitted, we must always have a sigh in our hearts until the Holy One returns to her. The Holy One said to them: by your lives! I burnt her, as it says “From above He has hurled fire into my bones…” (Lamentations 1:13) I will build her, as it says “Yet again will I rebuild you, then you shall be built, O virgin of Israel…” (Jeremiah 31:3) Zion said to Him: Behold, I have been sitting thus for many years! I have counted the days from old and I have not been redeemed, therefore I have despaired. She said that my master has abandoned me. And from where do we learn that Zion said this? From that which is written regarding it “And Zion said, ‘The Lord has forsaken me, and the Lord has forgotten me.’” (Isaiah 49:14) ... Another explanation. “And Zion said, ‘The Lord has forsaken me…” (Isaiah 49:14) What is written before this? “Sing, O heavens, and rejoice, O earth, and mountains burst out in song, for the Lord has consoled His people, and He shall have mercy on His poor.” (Isaiah 49:13) Once Zion saw that the prophet recalled His people and His poor, but did not mention Zion or Jerusalem she said ‘the Lord has forsaken me, and the Lord has forgotten me.’ Immediately the Holy One replied and said to her: just as it is impossible for a woman to forget her sucking child, so to I am not able to forget you, “Shall a woman forget her sucking child, from having mercy on the child of her womb?” (Isaiah 49:15) She said to Him: Master of the world! How is that possible? There is no end to the evils I have done! I caused Your Holy Temple to be destroyed and I killed the prophets. R’ Berachia the Kohen said in the name of Rebbe: the Holy One said to her, I will forget your evil but I will not forget your good. “…These too shall forget, but I will not forget you.” (ibid.) I have forgotten “"These are your gods, O Israel…” (Exodus32:4) but “I am the Lord, your God…” (Exodus 20:2) I will not forget.