The opening Pasuk of the Parashah states (BeReishit 18:1), “VeHu Yosheiv Petach HaOhel KeChom HaYom” which literally translated means “and he (Avraham) was sitting by the opening of the tent in the heat of the day.” Rashi interprets this to mean that Avraham was looking for an "Oveir VaShav," simply interpreted as a passerby, whom he eagerly wished to invite into his tent. Rav Yechezkel of Kuzmir, however, explains Rashi’s comment differently. Rashi’s word “Oveir” could also be translated as “one who has sinned,” and “VaShav” as referring to someone that wants to return. Thus, Avraham’s waiting outside his tent served a purpose beyond just inviting regular guests and travelers: he yearned to help them do Teshuvah as well. So when we learn the lesson of emulating Avraham’s zeal for Hachnasat Orchim despite the acute pain from his self-circumcision just three days prior, we can now add another layer of meaning—the importance of Kiruv, inspiring others to turn from their past faults and follow in the ways of God. Avraham made it his life-long mission to spread God’s voice to the world, even when “taking a day off” from his job would be perfectly understandable. As such, we, his children, should at least make the effort to incorporate this drive to inspire others as part of our daily life and personality.