EXTRA · Parashas Vayeishev · Passuk 38:18 · not a Torah Temimah citation on this passuk
And he said, “What pledge shall I give you?” She replied, “Your seal and cord, and the staff that you carry.” So he gave them to her and slept with her, and she conceived by him.
Classical source (EXTRA side-ring): Sotah 10a.
English: “Your seal and your cord and your staff” — these are three tokens of testimony that were given to her.
Derash on the verse (Bavli) — not a formal named middah of the 13. Three objects are counted as a complete set of proof.
Seal, cord, and staff form a threefold witness that Tamar will produce in judgment.