Psalms 129:6 Halakhah

יִ֭הְיוּ כַּחֲצִ֣יר גַּגּ֑וֹת שֶׁקַּדְמַ֖ת שָׁלַ֣ף יָבֵֽשׁ׃

Let them be as the grass upon the housetops, Which withereth afore it springeth up;