Another interpretation: they said, It is our wish to see our King, for hearing is not like seeing. The Omnipresent said to them: Give them what they asked, "for on the third day the LORD will come down," etc. "And you shall be unto Me a kingdom of priests" (above, verse 6). Rav Ashi said: Huna bar Natan told me: I was standing before Yazdegerd the king, and my belt had ridden up; he lifted it and set it right for me, and he said to me, "A kingdom of priests and a holy nation" is written concerning you. When I came before Ameimar, he said to me: in you is fulfilled, "And kings shall be your foster-fathers" (Isaiah 49:23). "All that the LORD has spoken we will do and we will hear" - it would have been fitting to say "we will hear and we will do." Rather, Israel said to the Holy One, blessed be He: Master of all worlds, before we heard them we had already fulfilled them. "I am the LORD" - Jacob fulfilled it, as it is said, "And Jacob said unto his household, Put away the strange gods" (Genesis 35:2). "You shall not take up the name in vain" (Exodus 20:7) - Abraham fulfilled it, as it is said, "I have lifted up my hand unto the LORD" (Genesis 14:22). "Remember the Sabbath" - Joseph fulfilled it, as it is said, "slay and make ready" (Genesis 43:16) [preparing on the eve for the day]. "Honor your father" - Isaac fulfilled it, when he was bound upon the altar. "You shall not murder" (Exodus 20:13) - Judah fulfilled it, "What profit is it if we slay our brother" (Genesis 37:26). "You shall not commit adultery" - Joseph fulfilled it, with the wife of Potiphar. "You shall not steal" - the tribes fulfilled it, "How then should we steal out of your lord's house silver or gold" (Genesis 44:8). "You shall not bear false witness" - Abraham fulfilled it, for he testified to all who come into the world that You are the Master of all deeds. He also fulfilled "You shall not covet," as it is said, "that I will not take from a thread even to a shoe-latchet" (Genesis 14:23).
We Will Do and We Will Hear and the Patriarchs Who Kept It First
Yalkut Shimoni on Torah 276:8
דָּבָר אַחֵר אָמְרוּ רְצוֹנֵנוּ לִרְאוֹת מַלְכֵּנוּ, לֹא דּוֹמֶה שׁוֹמֵעַ לְרוֹאֶה, אָמַר לָהֶם הַמָּקוֹם תֵּן לָהֶם מַה שֶּׁבִּקְּשׁוּ, "כִּי בַּיּוֹם הַשְּׁלִשִׁי יֵרֵד ה'" וְגוֹ'. (לעיל פסוק ו) "וְאַתֶּם תִּהְיוּ לִי מַמְלֶכֶת כֹּהֲנִים", אָמַר רַב אַשִׁי, אָמַר לִי הוּנָא בַּר נָתָן, הֲוָה קָאִימְנָא קַמֵּיהּ דְּיִזְגְּדַר מַלְכָּא, וַהֲוָה מִדְלִי לִי הֶמְיָינָאי וְתֵיתֵייהּ נִיהֲלֵיהּ, אָמַר לֵיהּ מַמְלֶכֶת כֹּהֲנִים וְגוֹי קָדוֹשׁ כְּתִיב בְּכוּ. כִּי אָתָאי לְקָמֵּיהּ דְּאֲמֵימַר אָמַר לֵיהּ אִיקַיֵּים בָּךְ (ישעיה מט, כג) "וְהָיוּ מְלָכִים אֹמְנַיִךְ". כֹּל אֲשֶׁר דִּבֶּר ה' נַעֲשֶׂה וְנִשְׁמָע, רָאוּי הָיָה לוֹמַר "נִשְׁמַע וְנַעֲשֶׂה" אֶלָּא אָמְרוּ יִשְׂרָאֵל לְהַקָּדוֹשׁ בָּרוּךְ הוּא רִבּוֹן כָּל הָעוֹלָמִים עַד שֶׁלֹּא שָׁמַעְנוּם קִיַּמְנוּם. "אָנֹכִי" קִיֵּם יַעֲקֹב, שֶׁנֶּאֱמַר (בראשית לה, ב) "וַיֹּאמֶר יַעֲקֹב אֶל בֵּיתוֹ וְגוֹ' הָסִירוּ אֶת אֱלֹהֵי הַנֵּכָר". (שמות כ, ז) "לֹא תִשָּׂא" קִיֵּם אַבְרָהָם, שֶׁנֶּאֱמַר (בראשית יד, כב) "הֲרִימֹתִי יָדִי אֶל ה'". "זָכוֹר" קִיֵּם יוֹסֵף, שֶׁנֶּאֱמַר (בראשית מג, טז) "וּטְבֹחַ טֶבַח וְהָכֵן". "כַּבֵּד" קִיֵּם יִצְחָק, כְּשֶׁנֶּעֱקַד עַל גַּבֵּי הַמִּזְבֵּחַ. (שמות כ, יג) "לֹא תִרְצַח" קִיֵּם יְהוּדָה, (בראשית לז, כו) "מַה בֶּצַע כִּי נַהֲרֹג אֶת אָחִינוּ". "לֹא תִנְאָף" קִיֵּם יוֹסֵף, בְּאֵשֶׁת פּוֹטִיפֶרַע. (שם) "לֹא תִגְנֹב" קִיְּמוּ הַשְּׁבָטִים, (בראשית מד, ח) "וְאֵיךְ נִגְנֹב מִבֵּית אֲדֹנֶיךָ כֶּסֶף אוֹ זָהָב". (שם) "לֹא תַעֲנֶה", קִיֵּם אַבְרָהָם, שֶׁהֵעִיד לְכָל בָּאֵי עוֹלָם שֶׁאַתָּה רִבּוֹן כָּל הַמַּעֲשִׂים. אַף הוּא קִיֵּם "לֹא תַחְמֹד", שֶׁנֶּאֱמַר (בראשית יד, כג) "אִם מִחוּט וְעַד שְׂרוֹךְ נַעַל".