Midrash su Salmi 90:17

On the seventh day after the Ten Commandments Moshe went up on the mountain, as it says "The Presence of the LORD abode on Mount Sinai, and the cloud hid it for six days..." (Shemot 24:16) This was in order for Moshe to purify himself. "On the seventh day He called to Moses from the midst of the cloud." (ibid.) "Moses went inside the cloud and ascended the mountain; and Moses remained on the mountain forty days and forty nights." (Shemot 24:18) On the 17th of Tammuz he came down and shattered the tablets, "The next day Moses said to the people, “You have been guilty of a great sin. Yet I will now go up to the LORD; perhaps I may win forgiveness for your sin.” Moshe went back up on the 18th of Tammuz and pleaded for mercy on behalf of Israel, as it is written "When I lay prostrate before the LORD those forty days and forty nights, because the LORD was determined to destroy you," (Devarim 9:25) At that moment, the Holy One once again viewed Israel with favor and said to Moshe to carve new tablets and to come up the mountain once again, as it says "Thereupon the LORD said to me, “Carve out two tablets of stone like the first, and come up to Me on the mountain; and make an ark of wood." (Devarim 10:1) He came down on the 28th of Av and carved the second tablets, as it says "So Moses carved two tablets of stone, like the first, and early in the morning he went up on Mount Sinai..." (Shemot 34:4) He went back up on the 29th of Av and the Torah was repeated to him a second time, as it says "I had stayed on the mountain, as I did the first time, forty days and forty nights; and the LORD heeded me once again: the LORD agreed not to destroy you." (Devarim 10:10) 'As I did the first time,' just as the first was a time of favor, so too the second were a time of favor- we can derive from this that those in the middle were a time of anger. He came down on the 10th of Tishre, which was Yom Kippur, and announced to them that they had found favor before God (Hamakom), as it says "Pardon our iniquity and our sin, and take us for Your own!” (Shemot 34:9) Therefore it was established as a fixed day and a remembrance for the generations, as it says "This shall be to you a law for all time: to make atonement for the Israelites for all their sins once a year..." (Vayikra 16:34)

He blessed them forthwith, as is said: And Moses blessed them (ibid.). What blessing did he confer upon them? Our sages said: O Lord, God of our fathers, etc. (Deut. 1:11). R. Meir held that he said: “May it be His will that the Shekhinah will rest within the labors of your hands,” and (that) they replied: And let the graciousness of the Lord our God be upon us (Ps. 90:17). Why is it stated so many times: According to all the Lord commanded Moses (Exod. 39:1)? Because the Israelites criticized Moses at the time they strove to erect the Tabernacle but could not do so. They said: “Perhaps the Holy One, blessed be He, told Moses some simple thing to do to erect the Tabernacle, and (thus) Moses alone is responsible for all this difficulty.” Therefore the Holy One, blessed be He, said: Since you have criticized him, I will attach My name to whatever I command him. Thus it is written: According to all the Lord commanded Moses.

15) What is the intent of (Vayikra 9:1) "And it was (on the eighth day")? We are hereby taught that (the day of the erection of the mishkan was as joyous before Him on high as the day of the creation of heaven and earth, of which it is written (Bereshith 1:5): "And it was evening and it was morning." And here it is written "And it was." And when Israel finished the work of the mishkan, Moses came and blessed them, viz. (Shemoth 39:43): "And Moses saw all the work … and Moses blessed them." With what blessing did he bless them? He said to them: "May the shechinah repose on the work of your hands. R. Meir says: He blessed them thus: "May the L–rd, the G d of your fathers, add to you, such as you, a thousand times!" (Devarim 1:11), and they responded: "And may the pleasantness of the L–rd our G d (His shechinah and His consolations) be upon us. And establish the work of our hands (the mishkan) upon us (that the shechinah reside therein), and the work of our hands (in our daily lives) establish it (that blessing repose upon it"). (Tehillim 90:7). And of that time it is written: "Go out and see, O daughters of Zion (children who are distinctive ["metzuyanim" (like "Zion")] with mitzvoth), the king Shelomoh (the King who is the source of peace [shalom] with the crown wherewith his mother crowned him." (Shir Hashirim 3:11). "his mother": This is the tent of meeting, which was distinctive with blue and purple wool, with scarlet and with linen. "his mother": This is none other than Israel, viz. (Isaiah 51:4): "And my nation (leumi), give ear to me." Read it not "leumi" but "leimi" (my mother).