Rashi interpreted to refer to Torah, which, like rain, provides life to the world. Rashi interpreted the request of Moses in for his speech to rain down "as the dew", "as the rain", to mean that it should come in small droplets. Rashi interpreted that Moses wanted to teach the children of Israel slowly, the knowledge "raining" down on the people in small portions, for if they were to be subject to all knowledge coming down at once, they would be overwhelmed and thus wiped out.