NET

15 You killed the Originator of life, whom God raised from the dead. To this fact we are witnesses!

Darby

15 but the originator^D7734 of life ye slew, whom God raised from among [the] dead, whereof *we* are witnesses.

Darby Bible Notes

originator - This word is difficult to render in English. It is a 'leader,' but it is more. It is used for one who begins and sets a matter on. The Greek word occurs four times in the New Testament, here and ch. 5.31; Heb. 2.10; 12.2. In Heb. 12.2 it means, 'he began and finished the whole course;' 'the origin' or 'originator,' though the word is harsh in connexion with life. The word is only used of our Lord.

KJV

15 And killed the Prince^K6751of life, whom God hath raised from the dead; whereof we are witnesses.

KJV Bible Notes

Prince: Or, author.