כִּֽי־לִפְנֵ֤י קָצִיר֙ כְּתָם־פֶּ֔רַח וּבֹ֥סֶר גֹּמֵ֖ל יִֽהְיֶ֣ה נִצָּ֑ה וְכָרַ֤ת הַזַּלְזַלִּים֙ בַּמַּזְמֵר֔וֹת וְאֶת־הַנְּטִישׁ֖וֹת הֵסִ֥יר הֵתַֽז׃
For before the harvest, when the blossom is over, And the bud becometh a ripening grape, He will cut off the sprigs with pruning-hooks, And the shoots will He take away and lop off.
Read halakhic rulings (Jewish law) on Isaiah 18:5: and classical halakhic sources.