1 Corinthians 15:9
"For I am the least of the apostles, that am not meet to be called an apostle, because I persecuted the church of God."
Cross References (ranked by relevance)
As for Saul, he made havock of the church, entering into every house, and haling men and women committed them to prison.
I am become a fool in glorying; ye have compelled me: for I ought to have been commended of you: for in nothing am I behind the very chiefest apostles, though I be nothing.
But they had heard only, That he which persecuted us in times past now preacheth the faith which once he destroyed.
For ye have heard of my conversation in time past in the Jews’ religion, how that beyond measure I persecuted the church of God, and wasted it:
For I suppose I was not a whit behind the very chiefest apostles.
Concerning zeal, persecuting the church; touching the righteousness which is in the law, blameless.