Midras Imamat 26:18: Sifra, Eikhah Rabbah, Vayikra Rabbah & Bamidbar Rabbah

1) (Vayikra 26:18) ("And if with these you do not hearken to Me, then I shall chastise you even more, seven-fold for your sins.") "with these" ("ad eileh"). R. Eliezer says: The Holy One does not bring calamity to Israel until he testifies ("me'id" [similar to" ad]) against them first, as it is written "And if ad eileh." R. Yehoshua says: Let Israel not say "The plagues have ended and He has no other to bring upon us"; it is, therefore, written "And if ad eileh" — still ("od [similar to "ad"]) I have others of these and like these to bring. Then I shall chastise you even more, seven-fold for your sins.": You transgressed seven transgressions ("not learning, not doing, etc.," viz. Section 2:3 above) — come and take upon yourselves seven calamities, (which follow).

“The Lord accomplished what He devised: He implemented His statement that He commanded from the days of old; He destroyed and had no compassion. He caused the enemy to rejoice over you, raised the horn of your antagonists” (Lamentations 2:17).
“Their heart cried to the Lord: Wall of the daughter of Zion, let tears fall like a stream, day and night; do not give yourself respite, let the apple of your eye not cease” (Lamentations 2:18).
“The Lord accomplished what He devised.” Rabbi Ahava son of Rabbi Ze’eira said: From the moment that the Holy One blessed be He said: “If despite this you do not heed Me…I, too, will walk with you casually” (Leviticus 26:18, 24), did He, Heaven forbid, do so? Rather, “the Lord accomplished [what He devised: He implemented [bitza] His statement that He commanded from the days of old].” He compromised.¹²¹The term bitzua also means compromise. Rabbi Yaakov of Kefar Ḥanan said: He rent [beza] His raiment.
“He caused the enemy to rejoice over you.” Rabbi Aḥa said: In good times, He rejoiced with them, as it is written: “For the Lord will return to rejoice over you for good, as He rejoiced over your fathers” (Deuteronomy 30:9). But in bad times, He causes others to rejoice. That is what is written: “He caused the enemy to rejoice over you, raised the horn of your antagonists.” In that regard it is said: “Their heart cried to the Lord: Wall of the daughter of Zion, [let tears] fall…”¹²²God caused the enemies to rejoice but He did not rejoice with them.

Rabbi Yosei bar Ḥanina interpreted the verse regarding a sota. “And if a person will sin” – she sinned to her husband, who feeds her and supports her, and she goes and acts corruptly with another. “And hear the voice of adjuration” – “The priest shall administer to the woman the oath of the curse” (Numbers 5:21). “And he is a witness” – “And there is no witness against her” (Numbers 5:13). “Who either saw” – “And it was hidden from the eyes of her husband” (Numbers 5:13), but not from the eyes of the Holy One blessed be He. “Or knew” – “and she was secluded and she was defiled” (Numbers 5:13). “If he does not tell, he shall bear his iniquity” – if she does not tell the priest, “her belly shall distend and her thigh shall fall” (Numbers 5:27).