Midrasch zu Wajikra 9:5

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."

"and they stood under the mountain": We are hereby apprised that the mountain was torn from its place and they came forward and stood under the mountain. 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."