English: “And you shall inquire and investigate and ask thoroughly” — From where do we know that we perform seven interrogations of the witnesses? From the verses “and you shall inquire and investigate and ask thoroughly,” “and you shall inquire thoroughly,” and “and the judges shall inquire thoroughly.”
On the daf / in context: The multiple expressions of thorough investigation in the Torah are counted to yield the seven formal questions that must be put to witnesses in capital cases.
Type of Learning
Derash on the verse (Sanhedrin) — the source of the seven chakiros.
What Is Learned
The seven formal interrogations of witnesses are derived from the repeated language of thorough inquiry in the Torah.