Which preposition to use with ephraimites

at Occurrences 1%

Not more surely did the lacking aspirate betray the Ephraimite at Jordan than the spelling of this manuscript corrector reveals the period at which he performed his labors.

from Occurrences 1%

SHIBBOLETH, a word by which the Gileadites distinguished an Ephraimite from his inability to sound the sh in the word, and so discovered whether he was friend or foe; hence it has come to denote a party cry or watchword.

Which preposition to use with  ephraimites