A.T. Robertson Commentary Acts 3:23

"And it shall be, that every soul that shall not hearken to that prophet, shall be utterly destroyed from among the people." — Acts 3:23 (ASV)

That prophet (του προφητου εκεινου). Emphasizes the future prophet as on "him" (αυτου) before "hearken." They had refused to "hearken" to Moses and now, alas, many had refused to "hearken" to Christ.

Shall be utterly destroyed (εξολεθρευθησετα). First future passive of εξολε- (ο) θρευω, a late verb, to destroy utterly (εξ), only here in the N.T., common in the LXX.