Although testimony of two witnesses may be combined in matters of financial law, each of the witnesses must deliver testimony concerning an entire matter, as we explained. If, by contrast, one witness testifies concerning a portion of a matter and the other witness testifies concerning another portion of the matter, we do not establish the matter on the basis of their testimony, as indicated by Deuteronomy 19:15: "According to the testimony of two witnesses shall the matter be established."
What is implied? One witness testifies that a person benefited from a field one year, another testifies that he benefited in the following year, and a third testifies that he benefited in the third year, the testimonies of the three cannot be linked together to say that he benefited for three years. For each of them testified only about a portion of the matter.
Similarly, if one witness testifies: "I saw one hair on the person's right side," and another witness testifies: "I saw one hair on the person's left side," their testimonies are not linked together so that we can say that two people testified that the person concerned manifested signs of physical maturity on that particular day. For each of them testified only about a portion of the physical signs required. Even if two witnesses testified that they saw one hair and two other witnesses testified that they saw another hair, their testimony is of no consequence. Since they both testified about only half the matter, this is not acceptable testimony.
If, however, one witness testified that he saw two hairs on the person's right side and another witness testified that he saw two hairs on the person's left side, their testimony can be linked together. Similar concepts apply in all analogous situations.