My preparation for war with the people of Syria (ash-Sham) while Jarir ibn `Abdillah al-Bajali is still there would be closing the door for Syria and prevention of its people from good action (i.e. allegiance) if they intend doing it.
However, I have fixed a time limit for Jarir after which he would not stay without either deception or in disobedience. My opinion is in favour of patience, so wait a while. (In the meantime) I do not dislike your getting ready.