And now, Moshe write you this song and teach it to the Israelites…Normally, a teacher lectures from written notes. Not Moses, he was a Prophet of God and when he taught, divine inspiration miraculously flowed through his mouth – he needed no notes. Now at the end of his life, says the Ha'amek Davar, he is instructed to do things the normal way: first write something down and then teach it. Torah may start off as something that needs divine inspiration but the final goal is to become the most normal and natural thing in the life of everyone…write you this song and teach it.
