וּמִצְרַ֕יִם הֶ֥בֶל וָרִ֖יק יַעְזֹ֑רוּ לָכֵן֙ קָרָ֣אתִי לָזֹ֔את רַ֥הַב הֵ֖ם שָֽׁבֶת׃
For Egypt helpeth in vain, and to no purpose; therefore have I called her arrogancy that sitteth still.
Read halakhic rulings (Jewish law) on Isaiah 30:7: and classical halakhic sources.