What Happened to the Apostles?
Jesus promised His apostles that they would be persecuted - "'A servant is not greater than his master.' If they persecuted Me, they will also persecute you" (John 15:20). According to sacred history and uninspired tradition, it appears that almost all of the apostles gave their lives for Christ:

Dear friends, these men gave everything for the cause of Christ because they believed in it with all their hearts. Are you giving your everything for the One who died for you? If not, you must strengthen your faith and commitment to the Lord! "Yes, and all who desire to live godly in Christ Jesus will suffer persecution" (II Tim. 3:12). "And you will be hated by all for My name's sake. But he who endures to the end will be saved" (Matt. 10:22). "Do not fear any of those things which you are about to suffer, indeed, the devil is about to throw some of you into prison, that you may be tested, and you will have tribulation ten days. Be faithful until death, and I will give you the crown of life" (Rev. 2:10).