Strong's #4828: summartureo (pronounced soom-mar-too-reh'-o)
from 4862 and 3140; to testify jointly, i.e. corroborate by (concurrent) evidence:--testify unto, (also) bear witness (with).
Thayer's Greek Lexicon:
́
summartureō
1) to bear witness with, bear joint witness
Part of Speech: verb
Relation: from G4862 and G3140
Citing in TDNT: 4:508, 564
Usage:
This word is used 4 times:
Romans 2:15: "hearts, their conscience also bearing witness, and their thoughts the mean while accusing"
Romans 8:16: "The Spirit itself beareth witness with our spirit, that we are"
Romans 9:1: "not, my conscience also bearing me witness in the Holy Ghost,"
Revelation 22:18: "For I testify unto every man that heareth the words of the prophecy"