Here we’ll talk about a case where the Shevuat HaEdut (oath of testimony) was imposed on somebody by an individual who was not the one claiming the money, but somebody else was trying to make him swear, and how that plays out.
The Mishnah says that the person claiming the money did not himself put forward the Shevuat HaEdut to these witnesses, but sent his servant instead to put it upon them. Or, if the defendant—the one who was being sued, the one whose money was being claimed because he owed somebody money—was trying to make a point and said to the witnesses, “I am making you swear: if you know testimony about the person who is claiming that I owe him money, you should come and testify on his behalf.” Then the witnesses denied knowing any of the testimony in question. The witnesses are not obligated to bring a korban (sacrifice), because they would only become obligated to bring a korban if they heard the request for testimony directly from the person claiming the money, and then heard the oath he imposed on them, and then answered Amen (so be it). If it comes from somebody else, if it comes from the Eved (servant), if it comes from the defendant, or if it comes from anybody else, it is all meaningless, and they would not be obligated to bring a korban.