Parashas Chayei Sarah · Passuk 24:65
and said to the servant, “Who is that man walking in the field toward us?” And the servant said, “That is my master.” So she took her veil and covered herself.
Rashi on Bereishis 24:65 (classical source on this passuk; not listed as a numbered Torah Temimah unit here).
Lemma / focus: ותתכס.
English: The form is passive (she covered herself); it is like “and she was buried” and “and it was broken.”
Derash on the verse (Rashi) — not a formal named middah of the 13: the verbal form is fixed as reflexive/passive covering.
When Rivkah learned that the man was Yitzchak she took the veil and covered herself; the covering is the modest response to the meeting with her intended.