It is narrated from Hazrat Aamir that if a person asks another, "Do you have witnesses?" He replies, "No." Then he himself comes and gives testimony in his favor. He (Aamir) replied that this testimony is permissible.

Hazrat Ja'far narrates that Hazrat Qasim bin Muhammad went to Hazrat Aban bin Uthman to bear witness regarding a person. That person reminded him of something during the testimony. He said, "I do not remember, and I have not remembered anything other than this." Then he left, and it came to his mind while the people were still sitting. He said, "He had asked me something regarding the testimony which I did not remember, and now I have remembered it. I bear witness that what he said is true, and I testify to it."