Acts 7

 After Stephen spoke historical records of how Israel continued to reject Moses and the prophets and that the Lord would raise up one like Moses (Christ), he charges - 

"Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.

52 Which of the prophets have not your fathers persecuted? and they have slain them which shewed before of the coming of the Just One; of whom ye have been now the betrayers and murderers:

53 Who have received the law by the disposition of angels, and have not kept it."  (Acts 7:51–53)

Thus speaking truth, he became the first martyr.