לְפָנָיו֙ רָ֣גְזָה אֶ֔רֶץ רָעֲשׁ֖וּ שָׁמָ֑יִם שֶׁ֤מֶשׁ וְיָרֵ֙חַ֙ קָדָ֔רוּ וְכוֹכָבִ֖ים אָסְפ֥וּ נָגְהָֽם׃
Before them the earth quaketh, The heavens tremble; The sun and the moon are become black, And the stars withdraw their shining.
Read halakhic rulings (Jewish law) on Joel 2:10: and classical halakhic sources.