They desire they yearn that law relates to the verbal action you should be pliable that you should yield to them so that they may be pliable towards you so that they may yield to you fa-yudhinūna is a supplement to tudhinu ‘you should be pliable’ but if it is understood to be the response to the optative clause of waddū ‘they yearn’ then a free standing pronoun hum should be read as implied before it after the fā’ sc. fa-hum yudhinūna.
