Midrash su Salmi 56:13

Rabbi Pinchas, Rabbi Levi and Rabbi Yochanan [said] in the name of Rabbi Menachem from Gallia: In the time to come, all sacrifices will be annulled - but the sacrifice of thanksgiving will not be annulled. All prayers will be annulled, but the prayer of gratitude will not be annulled. This accords with what is written [Jeremiah 33:11]: "The voice of joy and the voice of gladness, the voice of the groom and the voice of the bride, the voice of those who say 'Give thanks to the LORD of hosts' etc." - this is the prayer of gratitude. "Those who bring [the sacrifice of] thanksgiving to the House of the LORD": this is the sacrifice of thanksgiving. Thus David said: "I owe You vows and will offer you thanksgivings" [Psalms 56:13] - not "thanksgiving," but "thanksgivings," [indicating both] the thanksgiving prayer and the prayer of gratitude.

(Lev. 22:29:) “And when you sacrifice an offering of thanksgiving to the Lord.” R. Pinhas, R. Levi, and R. Johanan said in the name of R. Menahem of Galilee, “In the future to come, all [other] offerings shall cease, but the sacrifice of thanksgiving shall not ever cease.⁷⁴Lev. R. 27:12; PRK 9:12; M. Pss. 56:4. All [prayers] shall cease, but the [prayer] of thanksgiving shall not ever cease. Thus it is stated (in Jer. 33:11), ‘The sound of joy and the sound of gladness, the voice of the bridegroom and the voice of the bride, the voice of those who say, “Give thanks to the Lord of hosts, for the Lord is good, for His mercy endures forever”; [as they bring thanksgiving to the house of the Lord].’ ‘Give thanks to the Lord,’ this refers to the prayers; ‘as they bring thanksgiving,’ this refers to the sacrifice of thanksgiving.” And so David said (in Ps. 56:13), “Your vows, O God, are upon me; I will repay You with thanksgivings.” "Thanksgiving" (in the singular) is not written here, but “thanksgivings” (in the plural), [i.e., both] the thanksgiving prayer and the sacrifice of thanksgiving.

(Lev. 22:29:) AND WHEN YOU SACRIFICE AN OFFERING OF THANKSGIVING TO THE LORD. R. Pinhas, R. Levi, and R. Johanan said in the name of R. Menahem of Galilee: In the age to come all < other > offerings shall cease, but the sacrifice of thanksgiving shall not [ever] cease.⁸³Tanh., Lev. 8:14; Lev. R. 27:12; PRK 9:12; M. Pss. 56:4. All prayers shall cease, but the prayer of thanksgiving shall not [ever] cease. Thus it is stated (in Jer. 33:11): THE SOUND OF JOY AND THE SOUND OF GLADNESS, THE VOICE OF THE BRIDEGROOM AND THE VOICE OF THE BRIDE, THE VOICE OF THOSE WHO SAY: GIVE THANKS TO THE LORD [OF HOSTS, FOR THE LORD IS GOOD,] FOR HIS MERCY ENDURES FOREVER! [AS THEY BRING THANKSGIVING TO THE HOUSE OF THE LORD. (Ibid.:) GIVE THANKS TO THE LORD. This refers to the prayers. AS THEY BRING THANKSGIVING. This refers to the sacrifice of thanksgiving. And so David said (in Ps. 56:13 [12]): YOUR VOWS, O GOD, ARE UPON ME; I WILL REPAY YOU WITH THANKSGIVINGS. "Thanksgiving" (in the singular) is not written here, but THANKSGIVINGS (in the plural), < i.e., both > the thanksgiving prayer and the sacrifice of thanksgiving.