אָ֤ז תַּחְפֹּ֣ץ זִבְחֵי־צֶ֭דֶק עוֹלָ֣ה וְכָלִ֑יל אָ֤ז יַעֲל֖וּ עַל־מִזְבַּחֲךָ֣ פָרִֽים׃
Then wilt Thou delight in the sacrifices of righteousness, in burnt-offering and whole offering; Then will they offer bullocks upon Thine altar.
Find Mishnaic references to Psalms 51:21: , passages from the 63 tractates of the Mishnah.