Numbers 10:36

וּבְנֻחֹה יֹאמַר שׁוּבָה ה’ רִבְבוֹת אַלְפֵי יִשְׂרָאֵל

And when it rested, he said, “Return, Hashem, to the myriad thousands of the families of Israel."

This verse is recited as the Torah is replaced in the ark. The Talmud in Yevamos (64a) derives from this verse that it takes 22,000 Jews for G-d’s Presence to rest on Israel. “Revavos” (myriads) is 2 x 10,000, and “alfei” (thousands) is 2 x 1,000.