The expression tikkun olam is used in the Mishnah in the phrase mip'nei tikkun ha-olam ("for the sake of tikkun of the world") to indicate that a practice should be followed not because it is required by Biblical law, but because it helps avoid social disharmony.[3] One example is in Gittin4:2.
At first a person used to convene a Court in another place and cancel it. Rabban Gamliel the Elder enacted in the public interest (mip'nei tikkun ha-olam) that they should not do so. At first a person used to change his name and her name, the name of his city and the name of her city, and Rabban Gamliel the Elder enacted in the public interest (mip'nei tikkun ha-olam) that he should write, "The man so-and-so and every name that he has," "The woman so-and-so and every name that she has."[4]