Levítico 9:5 Midrash: Mekhilta DeRabbi Yishmael, Sifra & Shir HaShirim Rabbah

Concerning this it is stated in the Tradition (Song of Songs 2:14) "My Dove in the clefts of the rock … Show me Your face; let me hear Your voice. For Your voice is sweet and Your face is fair." "Show me Your face" — the twelve monuments for the twelve tribes of Israel (viz. Exodus 24:4). "Let me hear Your voice" — the Ten Commandments. "For Your voice is sweet" — after (hearing) the Ten Commandments. "and Your face is fair" — (Leviticus 9:5) "And the entire congregation came forward (on the eighth day of the investiture of the Cohanim) and they stood before the L–rd."

5) (Vayikra 9:5): "And they brought what Moses had commanded" — with zeal! "and all the congregation drew near and stood before the L–rd": They all drew near with joy and stood before Him. An analogy: A king grew angry at his wife and sent her away. After several days he was reconciled to her. Immediately, she girded her thighs, braced her shoulders and served him more assiduously than ever. Israel, likewise — when they saw that the L–rd had been conciliated to atone their sins, they all drew near with joy and stood before Him. Thus: "and all the congregation drew near and stood before the L–rd."

Rabbi Huna and Rabbi Aḥa bat Ḥanina interpreted the verse according to the opinion of Rabbi Meir regarding the Tent of Meeting. “My dove, in the clefts of the rock,” as they were hidden in the shelter of the Tent of Meeting. “Show me your appearance,” as it is stated: The congregation assembled at the entrance of the Tent of Meeting” (Leviticus 8:4). “Let me hear your voice,” “the people saw and they sang songs of praise” (Leviticus 9:24), they recited a fine song. Because they saw something new, they sang a new song. “For your voice is pleasant,” this is the song. “And your appearance is lovely,” just as it says: “The entire congregation approached and stood before the Lord” (Leviticus 9:5).
Rabbi Tanḥuma said: They interpreted it according to the opinion of Rabbi Meir regarding the Tent of Meeting; I, too, will interpret it according to the opinion of the Rabbis regarding the Temple. “My dove, in the clefts of the rock,” as they were hidden in the shelter of the Temple. “Show me your appearance,” just as it says: “Then Solomon assembled [the elders of Israel… and all the men of Israel assembled themselves to Solomon]” (I Kings 8:1–2). “Let me hear your voice,” just as it says: “It was when the trumpeters and singers were as one, to sound one voice” (II Chronicles 5:13). Rabbi Avin said in the name of Rabbi Abba Kohen ben Delaya: It is written: “The entire people responded together” (Exodus 19:8), and it is written: “The entire people responded in one voice and said” (Exodus 24:3). Until when did that voice stand to their credit? Until, “it was when the trumpeters and singers were as one, to sound one voice.”¹³⁰Because Israel had united in accepting the Torah, they merited to unite to sing praise to God at the building of the Temple (Maharzu). “For your voice is pleasant,” this is the song. “And your appearance is lovely,” these are the offerings, just as it says: “Solomon brought the peace offering that he offered to the Lord, cattle” (I Kings 8:63). What cattle? It was “four of the wagons and eight of the cattle” (Numbers 7:8).¹³¹These cattle had been used to transport the Tabernacle through the wilderness. Once the Temple was built and the Tabernacle was no longer in use, Solomon offered the cattle as offerings (Maharzu).