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Where is Is. 40:12 used in prayer?

The phrase וְכָל בַּשָּׁלִשׁ עֲפַר הָאָרֶץ from ישעיהו מ יב (used in the haftara of Vaeschanan) is very familiar to me from prayers, and I can't think where it's from. Moreover, Google is not ...