1 Samuel 10:7 - Joseph Benson’s Commentary on the Old and New Testaments

Do as occasion shall serve thee Hebrew, Do what thy hand findeth to do; that is, as thou shalt have a call and opportunity. As if he had said, I cannot give thee particular directions about every thing that is to be done by thee: but God's Spirit shall guide thee to do that which the present occasion requires. He does not intend that he should take the kingly government upon him, before his call to it was owned by the people, but that he should dispose his mind to a readiness of undertaking any public service when he should be called to his office.