Is it permissible to testify about a testimony given by an original witness before a judge or concerning a legally specified debt?

Primary text

If one hears a witness testifying before a judge concerning a right, or hears him testify about a right while attributing it to its cause (e.g., 'I testify that so-and-so owes so-and-so a thousand from the price of a sale'), then testimony based on this is permissible, according to Al-Qadi and the position of Al-Shafi'i. This is because testifying before the judge and attributing the right to its cause removes ambiguity and resolves uncertainty, making testimony about that testimony permissible, similar to when the request for testimony is explicit.