2Tim 3v12: "Yes, and all who desire to live godly in Christ Jesus will suffer persecution."
Heb 10v38: "Now the just shall live by faith; But if anyone draws back, My soul has no pleasure in him." (justification (and hence salvation), has always been by grace through faith, Eph 2v8, even in the OT. Rom 4v3, Hab 2v4, and also during the Great Tribulation. Rev 7v9,10,14, Acts 2v21)
Heb 11v36-40: "Still others had trial of mockings and scourgings, yes, and of chains and imprisonment. They were stoned, they were sawn in two, were tempted, were slain with the sword. They wandered about in sheepskins and goatskins, being destitute, afflicted, tormented — of whom the world was not worthy. They wandered in deserts and mountains, in dens and caves of the earth. And all these, having obtained a good testimony through faith, did not receive the promise, God having provided something better for us, that they should not be made perfect apart from us."
Note: That Paul places those saints who have suffered persecution for the Lord's sake amongst "the greats" of Heb 11.