sib.bo.let is used as the spoken test word at the Jordan fords in Judges 12:6.

The sole attested use places the feminine singular noun as the word speakers are told to say in a pronunciation test at the Jordan fords.

1. A word demanded in a spoken test · dominant

   In Judges 12:6, the absolute feminine singular form is the word addressed to a person with the command to say it; the APB renders the exchange, “Say now Shibboleth,” followed by the contrasting response “Sibboleth.”

   Judges 12:6

In the Anselm Project Bible: In Judges 12:6, the APB presents the term as “Shibboleth” in the demanded utterance and contrasts it with “Sibboleth” in the response.