Strong's Greek #1263
διεμαρτυράμεθα

Englishman's Concordance (References)

διεμαρτυράμεθα diemartyrametha — 1 Occurrence

1 Thessalonians 4:6 - V-AIM-1P
GRK:ὑμῖν καὶ διεμαρτυράμεθα
NAS: told you before and solemnly warned [you].
KJV: you and testified.
INT: you and fully testified