Midras Mazmur 104:35: Ein Yaakov (Glick Edition), Bamidbar Rabbah, Vayikra Rabbah & Midrash Tanchuma

Let us see: The passage (Ps. 19, 15.) May the words of my mouth he acceptable, can be explained in the past tense, and it may be explained in the future tense. Why then have the Rabbis decided to say it after the Eighteen Benedictions and not before? R. Juda, the son of R. Simon b. Pazi, said: "Because David did not say this verse until after he had said eighteen chapters, therefore did the Rabbis decree [to say it] after the Eighteen Benedictions." Is it after eighteen? Behold! it is after nineteen? Aye! the first two chapters, viz., Happy is the man, and Wherefore do heathens rage, are only one chapter, for R. Juda, the son of R. Simon b. Pazi, said: "One hundred and three chapters were uttered by David, and he did not say Hallelujah until he had contemplated the downfall of the wicked; as it is said (Ps. 104, 35.) Let the sinners be taken completely out of the earth, and let the wicked be no more; Bless the Lord, O my soul. Hallelujah! Instead of one hundred and three, we ought to say, one hundred and four? but we infer this, that Blessed is the man, and Why do the heathens rage, are but one psalm. (Fol. 10a) As R. Samuel b. Nachmeini in the name of R. Jonathan said: 'Every chapter that was beloved by David, he began and concluded it with the word, Happy; It began with Happy is the man (Ps. 1, 1), and ended with Happy are all they that put treir trust in Him (Ib. 2, 10).' [This proves that the first two chapters are one]."

There were some highwaymen in the neighborhood of R. Meier who annoyed him so much that he once prayed that they should die; but his wife Baruriah said to him: "How do you justify this? [such prayer?] Is it because, it is written (Ps. 104, 35.) Let sin be consumed [which you understand to mean that the wicked should be destroyed]; behold is it then written The sinners? It is written sin! Besides, read the last part of this verse And the wicked will be no more. Pray, therefore [on their behalf] , that they may be led to repentance and the wicked will be no more." He did pray for them and thereupon they were led to repent. A Sadduce once asked R. Abuhu: "It is written (Ps. 3, 1.) A psalm of David when he fled from his son, Abshalom, and it is written (Ib. 57, 1.) By David a Michtam, when he fled from Saul. Let us see, which event occurred first? Was it not the incident with Saul? Why then is it written last? "Aye," R. Abuhu said to him, "you, who do not recognize the rule of contiguous passages find this difficult, but to us who recognize the rule of contiguous passages, it is not at all difficult; for R. Jochanan said: "What is the Biblical proof for the rule of contiguous passage? It is said (Ps. 111, 8.) They are well supported forever and eternally they are framed in truth and uprightness. Why is the story of Abshalom placed near the chapter of Gog and Magog? If one should ask you, 'Is it possible that a slave (Gog and Magog) shall rebel against his master (God)?' answer him: 'How is it possible that a son shall rebel against liis own father? Yet, it did so happen (with Abshalom); so is this also possible.' "

“The Lord spoke to Moses, saying: I have hereby taken the Levites from among the children of Israel in place of every firstborn, first issue of the womb from the children of Israel, and the Levites shall be Mine. For every firstborn is Mine; on the day that I smote all the firstborn in the land of Egypt I sanctified to Me every firstborn in Israel, from man to animal; they shall be Mine; I am the Lord” (Numbers 3:11–13).
“The Lord spoke to Moses, saying: I have hereby taken…”: “I [vaani]” – joyfully, “hereby [hineh]” – willingly; the statement of Rabbi Yishmael. His students said to him: Our teacher, because it says: “I [vaani] am hereby [hineni] bringing the flood, water” (Genesis 6:17), do I hear that there is joy before the Omnipresent? He said to them: There is joy before the Omnipresent when those who anger Him are eradicated. Likewise it says: “With the good of the righteous the city exults…” (Proverbs 11:10); and it says: “You have broken the teeth of the wicked…” (Psalms 3:8); and it says: “Salvation belongs to the Lord…” (Psalms 3:9); and it says: “The Lord is King forever and ever; [nations have] perished [from His land]” (Psalms 10:16); and it says: “May sinners be eliminated [from the earth, and may the wicked be no more]” (Psalms 104:35); and it says: “And with the eradication of the wicked there is singing” (Proverbs 11:10).
Rabbi Natan says: “I [vaani]” – I add to their love.¹⁵That is, God’s love for them. Hineh – joyfully; likewise it says: “Behold [hineh], he too is going out to meet you, and he will see you and rejoice in his heart” (Exodus 4:14). The Rabbis say: Everywhere that vaani is stated, it is, as it were, the Holy One blessed be He and His court. The paradigm of them all: “And the Lord [vadonai] spoke evil of you” (I Kings 22:23).¹⁶I Kings 22:19–22 contains a description of the heavenly court.