Midrasch zu Dewarim 28:65

“And great enslavement,” Rabbi Aḥa said: Because they would keep the Hebrew slave in servitude, just as it says: “At the end of seven years [each of] you shall free [his Hebrew brother]” (Jeremiah 34:14).
“She settled among the nations, did not find rest,” Rabbi Yudan ben Rabbi Neḥemya said in the name of Rabbi Shimon ben Lakish: Had she found rest, she would not have returned. Similarly, “the dove did not find rest” (Genesis 8:9). Similarly, “among these nations you will not be calm, and there will be no rest for your foot” (Deuteronomy 28:65).
“All her pursuers have overtaken her within the straits [hametzarim].” This is like what we learned, the statement of ben Nanas: By her demarcations and her borders [uvmetzranav].⁸⁸Mishna, Bava Batra 7:3. The midrash cites this mishna to explain the Hebrew term employed in the verse in Lamentations. The word hametzarim, the straits, is understood to mean within her borders.
Another matter, “All her pursuers have overtaken her within the straits,” in days of distress, between the seventeenth of Tamuz and the ninth of Av,⁸⁹The walls of Jerusalem were breached on the seventeenth of Tamuz and the Temple was ultimately destroyed on the ninth of Av (Mishna, Taanit 4:6). during which Ketev Meriri⁹⁰This is the name of a destructive demon. See Pesaḥim 111b. is prevalent, just as it says: “Nor the pestilence that stalks in darkness, nor the destruction [ketev] that lays waste at noon” (Psalms 91:6). Rabbi Abba bar Kahana and Rabbi Levi, Rabbi Abba bar Kahana said: It passes through during the main time of sunlight,⁹¹The part of the day when the sun is strongest. from the beginning of the sixth hour until the end of the ninth.⁹²These are halakhic hours. In this system, the daylight hours are divided into twelve equal parts. Rabbi Levi said: It passes through the main part of the day, from the end of the fourth hour until the beginning of the ninth. It does not pass through the sunlight or the shade, but rather through the shade adjacent to the sunlight.
Rabbi Yoḥanan and Rabbi Shimon ben Lakish, Rabbi Yoḥanan said: It is completely full of eyes, scales, and hair. Rabbi Shimon ben Lakish said: One eye is situated on its heart, and anyone who sees it falls and dies. There was an incident involving a certain pious man who saw it and he fell on his face and died. Some say it was Yehuda ben Rabbi [Yehuda Hanasi]. Shmuel saw it and did not fall. He said: It is [just] a house snake.
Rabbi Abahu was sitting and studying in a synagogue in the area of Caesarea. He saw a certain person who was carrying a stick and going to strike another person. He saw a demon standing behind him carrying an iron rod. [Rabbi Abahu] stood and called out to him, saying to him: ‘Why do you seek to kill your counterpart?’ [The man] said to him: ‘Can a person kill another with this?’ He said to him: ‘There is a demon standing behind him that is carrying an iron rod. You strike him with this and it will strike him with that and he will die.’
Rabbi Yoḥanan would instruct the teachers of Bible and the teachers of Mishna not to raise a strap to the children during those days.⁹³The days between the seventeenth of Tamuz and the ninth of Av. Rabbi Shmuel bar Naḥmani would instruct the teachers of Bible and the teachers of Mishna to dismiss the children during those four hours.⁹⁴He did not want the teachers to instruct the children at all during the four hours when Ketev Meriri is active in the world, lest the teachers strike the students, which could lead to danger due to the demon.

(Lev. 26:3:) “If you walk in My statutes….” This text is related (to Hos. 9:17), “My God will reject them because they did not heed Him….” The Holy One, blessed be He, said, “I have said that you would be set in security, as stated (in Amos 9:15), ‘And when I plant them in their land, [they shall never again be uprooted]….’ When? (Lev.: 26:3, 5:) ‘If you walk in My statutes […] You shall eat your fill of bread.’ But you did not so act.” Instead (according to II Kings 17:9), “The Children of Israel attributed things which were not right to the Lord.” [So] I have also set upon you things which I did not write in My Torah. [It is so stated] (in Deut. 28:61), “Moreover [the Lord will bring upon you] every disease and every plague which is not written [in this book of the Torah].” Now what were the “things they attributed, which were not right to the Lord?” As Isaiah said (in Is. 1:4), “They have forsaken the Lord […];” do not say, “They have forsaken ('zbw) [Me],” but “They,” as it were, “have made me worth forsaking ('yzbw) (i.e., caused me to be cruel).” Now I was called (in Exod. 34:6), “The Lord, the Lord, a merciful and gracious God.” But through their sins, they have made Me cruel and changed My trait of mercy to cruelty, as stated (in Lam. 2:5), “The Lord has become like an enemy, He swallowed Israel.” It also says (in Is. 63:10), “But they rebelled, and grieved His holy spirit; then He became their enemy, and Himself made war against them.” Therefore, Hosea said, “Who has brought this about for you? [It was] because you did not heed Him, (in Hos. 9:17), ‘My God will reject them because they did not heed Him.’” It is also written (in Deut. 28:65), “And among those nations you shall find no peace. Another interpretation (of Lev. 26:3, 4, 14, 19) “If you walk in My statutes…, then I will give you your rains in their season…. But if you do not heed Me…. I will make your heavens like iron”: It also says so (in Hag. 1:10), “For that reason the heavens over you have withheld dew, and the earth has withheld its produce.” Because of your sins, the nations are also afflicted. R. Joshua ben Levi said, “If the nations had known that they are afflicted because of the sins of Israel, they would have raised two armies²Gk.: stratiai. to guard each and every person of Israel in order that they keep the Torah and not sin. However, it was not enough for the nations that they were not watching over Israel, but in addition they stopped them from [fulfilling] the commandments.” As when Israel sins, all the whole world is afflicted, as stated (in Hag. 1:10), “For that reason the heavens over you have withheld dew.” But if [the Israelites] do not sin, all the world is blessed on their account, as stated (in Gen. 26:4), “and through your seed shall all the nations of the earth be blessed.” The Holy One, blessed be He, said to Moses (in Exod. 20:19-20), “You yourselves have seen that I spoke with you from the heavens. Along with Me you shall not make gods of silver, nor shall you make for yourselves gods of gold.” So if you sin [and pray to me], I will not answer you, as stated (in Zech. 7:13), “And it came to pass that, as He called, and they did not heed; ‘So let them call, and I will not heed,’ [says the Lord of hosts].” Therefore (according to Exod. 20:20), “Along with Me you shall not make gods of silver.”

[(Lev. 26:3:) IF YOU WALK IN MY STATUTES….] This text is related (to Hos. 9:17): GOD³Eloah. Cf. the Masoretic Text, which reads elohay (MY GOD). WILL REJECT THEM BECAUSE THEY DID NOT HEED HIM. The Holy One said: I have said that you would be set in security, as stated (in Amos 9:15): AND WHEN I PLANT THEM IN THEIR LAND, [THEY SHALL NEVER AGAIN BE UPROOTED]….⁴Tanh., Lev. 10:2. When? (Lev.: 26:3, 5:) IF YOU WALK IN MY STATUTES…. YOU SHALL EAT YOUR FILL OF BREAD < AND DWELL SECURELY IN YOUR LAND >. I have so counseled, but you did not so act. Instead (according to II Kings 17:9): THE CHILDREN OF ISRAEL ATTRIBUTED THINGS WHICH WERE NOT RIGHT < TO THE LORD THEIR GOD: THEY BUILT THEMSELVES HIGH PLACES IN ALL THEIR CITIES >…. I have also set upon you things which I did not write in the Torah. It is so stated (in Deut. 28:61): MOREOVER < THE LORD WILL BRING UPON YOU > EVERY DISEASE AND EVERY PLAGUE WHICH IS NOT WRITTEN IN {THIS BOOK OF THE TORAH} [THE BOOK OF THIS TORAH]. Now surely [if] you have set [things] on me which were not < right > by me, just as Isaiah said (in Is. 1:4): THEY HAVE FORSAKEN THE LORD; do not say: THEY HAVE FORSAKEN ('ZBW) < ME >, but: They, as it were, have made me worth forsaking ('YZBW) (i.e., caused me to be cruel). Now I was called (in Exod. 34:6): A MERCIFUL AND GRACIOUS GOD, SLOW TO ANGER, but through their sins I have become cruel and changed my nature, as stated (in Lam. 2:5): THE LORD HAS BECOME LIKE AN ENEMY. It also says (in Is. 63:10): SO HE WAS TURNED INTO THEIR ENEMY. Therefore, Hosea says: Who has brought this about for you? < It was > because you did not heed him, as stated (in Hos. 9:17): {GOD} [MY GOD] WILL REJECT THEM BECAUSE THEY DID NOT HEED HIM. [It is also written] (in Deut. 28:65): AND AMONG THOSE NATIONS YOU SHALL FIND NO PEACE.