אֲשֶׁ֤ר לֹֽא־יִסָּפֵר֙ צְבָ֣א הַשָּׁמַ֔יִם וְלֹ֥א יִמַּ֖ד ח֣וֹל הַיָּ֑ם כֵּ֣ן אַרְבֶּ֗ה אֶת־זֶ֙רַע֙ דָּוִ֣ד עַבְדִּ֔י וְאֶת־הַלְוִיִּ֖ם מְשָׁרְתֵ֥י אֹתִֽי׃ (ס)
As the host of heaven cannot be numbered, Neither the sand of the sea measured; So will I multiply the seed of David My servant, And the Levites that minister unto Me.
Read halakhic rulings (Jewish law) on Jeremiah 33:22: and classical halakhic sources.