Strong's G3513 · Greek

νή

ne · nay

probably an intensive form of 3483; a particle of attestation (accompanied by the object invoked or appealed to in confirmation); as sure as

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 νή , particle of affirmation employed in oaths, [in LXX: ν. τ. ὑγίειαν , Ge 42:15 , 16 ( חֵי )*;] by : c. acc., I Co 15:31 .† 

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