King James Version (KJV)
For the Egyptians shall help in vain, and to no purpose: therefore have I cried concerning this, Their strength {is} to sit still. {concerning...: or, to her}
Modern English
For Egypt helps in vain, and to no purpose; therefore I have called her Rahab who sits still.
Hebrew
וּמִצְרַ֕יִם הֶ֥בֶל וָרִ֖יק יַעְזֹ֑רוּ לָכֵן֙ קָרָ֣אתִי לָזֹ֔את רַ֥הַב הֵ֖ם שָֽׁבֶת׃
vmiṣrayim hebel variyq yaʿzorv laken qaraʾtiy lazoʾt rahab hem shabet