English: “Let me flee there.” Rabbi Yitzchak said: The settlement of Tzoar lasted fifty-one years, as it is written “Let me flee there (na)”; “na” has the numerical value of fifty-one.
On the daf / in context: The word “na” is read gematria-style to give the duration of Tzoar’s existence before the destruction of the cities of the plain.
Type of Learning
Derash on the verse (Bavli / gematria) — not a formal named middah of the 13. The particle “na” yields a chronological figure.
What Is Learned
Tzoar had been settled for fifty-one years; the gematria of “na” (“please / there”) supplies the number.