Aliya Summary: Moshe designates three cities of refuge on the eastern side of the Jordan River. These cities provided refuge for an individual who inadvertently murdered another.
The Gemara explains that although the cities wouldn’t become active refuge havens until the Jews settled in Israel, Moshe saw this as an opportunity to do something positive and would not pass up the chance. It’s not just that he seized the opportunity to perform a Mitzvah (positive commandment), he took this opportunity to prepare to do a Mitzvah! In modern day, that would be the equivalent of us waking up earlier than normal to daven (pray), or going out of our way so we can be asked to do Chessed (a kind act). It’s looking for circumstances where opportunities might exist.