https://thornhillkollel.com/wp-content/uploads/2016/05/eruvin-perek-ches-mishna-5-does-a-person-who-is-not-spending-shabbos-in-a-courtyard-need-to-contribute-to-the-eruvei-chatzeiros.mp3“eruvin perek ches mishna 5 does a person who is not spending shabbos in a courtyard need to contribute to the eruvei chatzeiros”.