Gittin 40b-42a
For Tikkun Olam, the court requires a creditor with a lien on a slave who was subsequently freed by his master to additionally free him as "shidduch insurance" for his children \u2022 The master who frees this slave must compensate the lien-holder for impairing the debt \u2022 When are small sins warranted to prevent great sins? \u2022 When will the court require one to sin? \u2022 Is there a mitzvah in participating in a Minyan? \u2022 The Magen Avraham is puzzled by the Ran; if self-interest motivates the emancipation, how is freeing a slave for a Minyan sinful?