King James Version (KJV)
If he will contend with him, he cannot answer him one of a thousand.
Modern English
If one wished to contend with him, one could not answer him once in a thousand times.
Hebrew
אִם יַחְפֹּ֣ץ לָרִ֣יב עִמּ֑וֹ לֹא יַעֲנֶ֥נּוּ אַ֝חַ֗ת מִנִּי אָֽלֶף׃
ʾim yaḥpoṣ lariyb ʿimvo loʾ yaʿanenv ʾaḥat miniy ʾalef