Strong's Concordance

Original word: ἐπιμαρτυρέω
Transliteration: epimartureó
Definition (short): testifying
Definition (full): to bear witness to

NAS Exhaustive Concordance

Word Origin: from epi and martureó
Definition: to bear witness to
NASB Translation: testifying (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From epi and martureo; to attest further, i.e. Corroborate -- testify.

see GREEK epi

see GREEK martureo

KJV: By Silvanus, a faithful brother unto you, as I suppose, I have written briefly, exhorting, and testifying that this is the true grace of God wherein ye stand.
NASB: Through Silvanus, our faithful brother (for so I regard him), I have written to you briefly, exhorting and testifying that this is the true grace of God. Stand firm in it!