Reference for Chullin 182:40

פעם אחת בחודש ואמרי לה

Moreover, the ministering angels do not begin to sing praises in heaven until Israel have sung below on earth, for it is said: When the morning stars sang together, then all the sons of God shouted for joy!<span class="x" onmousemove="('comment',' Job XXXVIII, 7. The morning stars are Israel who are likened to the stars, and the sons of God are the angels. The objection therefore is: How then can it be said above that a division of ministering angels sing: Holy (is) the Lord of hosts, thus mentioning the name of God after one word?');">²¹</span>

Akdamut Milin

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