אֱמֹ֕ר אֶל־זְרֻבָּבֶ֥ל פַּֽחַת־יְהוּדָ֖ה לֵאמֹ֑ר אֲנִ֣י מַרְעִ֔ישׁ אֶת־הַשָּׁמַ֖יִם וְאֶת־הָאָֽרֶץ׃
’Speak to Zerubbabel, governor of Judah, saying: I will shake the heavens and the earth;
Read halakhic rulings (Jewish law) on Haggai 2:21 from the Mishneh Torah and classical halakhic sources, free online.