'And Amalek came' means falsity arising from interior evil. 'And fought with Israel in Rephidim' means that they attacked them when they were enduring bitter temptation. 'And Moses said to Joshua' means a Divine influx into truth that engages in conflict. 'Choose men for us' means that he should draw truths up in formation for battle. 'And go out, fight against Amalek' means against falsities arising from interior evil. 'Tomorrow I stand on the top of the hill' means the joining of God's truth to the good of charity, and influx from there. 'With the rod of God in my hand' means that this will be a source of power.