Islamic law permits testimony as a means of establishing rights before the courts due to the people's need for it. That testimony is a trust that must be performed upon its request. So the witness does not have the right to arrange judgments on the grounds for it, but his job is to say what he hears in terms of acknowledgment and pledge of allegiance, or what he has seen of authorization and destruction. Then he transmits that to the judge, then the judge’s job is to arrange the effects on their causes, so the witness is a mediator, and the judge is disposed, and the binding reasons differ in them. Based on the aforementioned, I took research and extrapolation in the books of likenesses and analogues, especially the book of "Al-Ashbaah Wal-Nada'er" by Imam Al-Suyuti. It is a reason according to one of the imams, hence I liked to study the important of these issues of jurisprudence scientific study in an independent research. I have recorded it under the title: (Selections Of Jurisprudential Issues In Which Reason Must Be Mentioned In Book Of "Al-Ashbaah Wal-Nada'er" By Imam Al-Suyuti (D: 911 A.H.) - Testimony Topic Model -, naming, fourteen issues, proven in the folds of research.