Midras Keluaran 34:8: Ein Yaakov (Glick Edition) & Midrash Tehillim

(Ib. 34, 8) And Moses made haste, and bowed his head. What had he seen [that he bowed himself]? R. Chanina b. Gamla said: "He saw the attribute long-suffering." And the Rabbis said: "He saw the attribute Emeth (truth)." We are taught in a Baraitha in accordance with him who said he had seen the attribute long-suffering, viz: When Moses ascended to heaven, he found that the Holy One, praised be He! was sitting and writing the words long-suffering. And he said before Him: "Sovereign of the Universe! does this mean long-suffering for the righteous ones?" And he was answered: "Even for the wicked." "The wicked," Moses remarked, "ought to perish!" The Lord answered him: "In the future thou wilt see that My previous words will be necessary for thee." Thereafter when Israel sinned, the Lord said to Moses: "Didst thou not say long-suffering [only] for the righteous?" And Moses said before Him: "Sovereign of the Universe, but hast Thou not said to me, 'Also to the wicked'?" And concerning this it is written (Num. 14, 17) (Ib. b) And now, I beseech thee, let the greatness of the power of the Lord be made manifest as Thou hast spoken." R. Chaggi, ascending the steps of the college of Rabba b. Shila, heard a child reciting (Ps. 93, 5) Thy testimonies are exceedingly steadfast. In thy house abideth holiness, O Lord, to the utmost length of days. Immediately he began (Ib. 90, 1) A prayer of Moses. And he then said: "Infer from this that Moses saw the attribute long-suffering."

Your testimony is very reliable. Moses said before the Lord, "Master of the Universe, humble the voice of the Torah and raise the voice of Your House, and elevate the voice of the wicked. If You do so, Your House will be a holy abode for all time." Solomon built it and Ezra built it again after it was destroyed, but now it will stand forever. Rabbi Simon said there are thirteen attributes of mercy, as it says, "The Lord, the Lord, compassionate and gracious." Rav said there are eleven, and the rabbis said there are ten. As to which one to bow down to, Rav Hisda said it is for the attribute of kindness, as it says, "Moses quickly bowed down to the ground in homage" (Exodus 34:8). Rabbi Eliezer ben Jacob said it is for the attribute of patience, and the rabbis said it is for the attribute of mercy. Rabbi Isaac said Moses asked the Lord, "Why does a person sin, yet You do not immediately punish him?" The Lord said to him, "Moses, you should not have asked this question. I have not revealed to you My ways, yet you ask such a question? I swear by My life that you will need this knowledge." Moses persisted until the Lord said, "I have forgiven them as you have asked" (Numbers 14:20). Moses then said, "Now let the power of the Lord be great, as You have promised, saying, 'The Lord is slow to anger and abounding in kindness.'" Rabbi Haggai said he went down to Daflesit in Tiberias and heard the congregation there say, "Your testimony is very reliable." One might think that just as the Lord is patient with the wicked, He is also patient with the righteous. Therefore, it says, "To God, vengeance belongs."