Strong's G1964 · Greek

ἐπιορκέω

epiorkeo · ep-ee-or-keh'-o

from 1965; to commit perjury

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 ** ἐπιορκέω , -ῶ ( ἐπίορκος ), [in LXX: I Es 1:48 , Wi 14:28 * ;] to swear falsely, forswear oneself : Mt 5:33 .† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain