Acts 1:22 N-AMS
BIB: ἀφ' ἡμῶν μάρτυρα τῆς ἀναστάσεως
NAS: [must] become a witness with us of His resurrection.
KJV: be ordained to be a witness with
INT: from us a witness of the resurrection

Acts 26:16 N-AMS
BIB: ὑπηρέτην καὶ μάρτυρα ὧν τε
NAS: you a minister and a witness not only
KJV: and a witness both
INT: a servant and a witness of that both

2 Corinthians 1:23 N-AMS
BIB: Ἐγὼ δὲ μάρτυρα τὸν θεὸν
NAS: God as witness to my soul,
KJV: call God for a record upon my
INT: I moreover as witness God