Execution by
Of John
And he sent, and beheaded John in the prison. (Matthew 14:10)
And immediately the king sent an executioner, and commanded his head to be brought: and he went and beheaded him in the prison, (Mark 6:27)
Of James
And he killed James the brother of John with the sword. (Acts 12:2)
Of the martyrs
And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years. (Revelation 20:4)
See PUNISHMENT