King James Version (KJV)
Now there was an appointed sign between the men of Israel and the liers in wait, that they should make a great flame with smoke rise up out of the city. {sign: or, time} {and: Heb. with} {flame: Heb. elevation}
Modern English
Now the appointed sign between the men of Israel and the ambushers was that they should make a great cloud of smoke rise up out of the city.
Hebrew
וְהַמּוֹעֵ֗ד הָיָ֛ה לְאִ֥ישׁ יִשְׂרָאֵ֖ל עִם־הָאֹרֵ֑ב הֶ֕רֶב לְהַעֲלוֹתָ֛ם מַשְׂאַ֥ת הֶעָשָׁ֖ן מִן־הָעִֽיר׃
vhamvoʿed hayah lʾiysh yishraʾel ʿim-haʾoreb hereb lhaʿalvotam mashʾat heʿashan min-haʿiyr