'And Jehovah said to Moses' means instruction. 'Write this [for] a memorial in the book' means for everlasting remembrance. 'And put it in the ears of Joshua' means with a view to obedience on the part of truth engaged in conflict with that falsity. 'That I will utterly blot out the memory of Amalek from under heaven' means that that falsity is to be completely removed, so that it may no longer engage in conflict. 'And Moses built an altar' means for the holiness of worship and of remembrance. 'And called the name of it Jehovah Nissi' means constant warfare and the Lord's protection against those steeped in falsity arising from interior evil. 'And he said, Because [Amalek's] hand is against the throne of Jah' means because they wish to do violence to the Lord's spiritual kingdom. 'The war of Jehovah will be against Amalek from generation to generation' means that by the Lord's Divine power they have been subjugated and cast into hell, out of which they can never rise up.