Strong's Concordance G1964

Original Word: ἐπιορκέω
Transliteration: epiorkéō
Phonetic Spelling: ep-ee-or-keh'-o
[ἐπιορκέω] from G1965; to commit perjury

Usages throughout the bible

Matthew 5:33 - Again, ye have heard that it hath been said by them of old time, Thou shalt G1964 not forswear thyself, G1964 but shalt perform unto the Lord thine oaths: