EXTRA · Parashas Vayeishev · Passuk 38:17 · not a Torah Temimah citation on this passuk
He replied, “I will send a kid from my flock.” But she said, “You must leave a pledge until you have sent it.”
Classical source (EXTRA side-ring): Sotah 10a.
English: “I will send a kid of the goats” — from here, that the righteous attach their word to a concrete act.
Derash on the verse (Bavli/midrash style) — not a formal named middah of the 13. Specificity of the promise is treated as a mark of integrity.
A righteous person’s word is tied to a definite action — here, a kid from the flock.