יָבֵ֤שׁ חָצִיר֙ נָ֣בֵֽל צִ֔יץ כִּ֛י ר֥וּחַ יְהוָ֖ה נָ֣שְׁבָה בּ֑וֹ אָכֵ֥ן חָצִ֖יר הָעָֽם׃
The grass withereth, the flower fadeth; Because the breath of the LORD bloweth upon it— Surely the people is grass.
Read halakhic rulings (Jewish law) on Isaiah 40:7: and classical halakhic sources.