Strong’s Greek
G3513 — ne
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
νή
ne — pronounced nay
probably an intensive form of 3483; a particle of attestation (accompanied by the object invoked or appealed to in confirmation); as sure as:--I protest by. see GREEK for 3483
1 occurrence in the KJV.
1 Corinthians 15:31
I protest by your rejoicing which I have in Christ Jesus our LORD, I die daily.