24 When he and his little band had taken departure from the others, "he traveled through all Friesland, ceaselessly preaching the word of God, banishing pagan rites and extirpating immoral heathen customs. With tremendous energy he built churches and overthrew the idols of the temples. He baptized thousands of men, women and children." After he had arrived in the northern regions of Friesland and was about to administer the Sacrament of Confirmation to a large number of newly baptized converts, a furious mob of pagans suddenly attacked and threatened to kill them with deadly spears and swords. Then the holy prelate serenely advanced and "forbade his followers to resist, saying, 'Cease fighting, my children, for we are truly taught by Scripture not to return evil for evil, but rather good. The day we have long desired is now at hand; the hour of our death has come of its own accord. Take strength in the Lord, . . . be courageous and do not be afraid of those who kill the body, for they cannot slay an immortal soul. Rejoice in the Lord, fix the anchor of hope in God, Who will immediately give you an eternal reward and a place in the heavenly court with the angelic choirs'." All were encouraged by these words to embrace martyrdom. They prayed and turned their eyes and hearts to heaven where they hoped to receive soon an eternal reward, and then fell beneath the onslaught of their enemies, who stained with blood the bodies of those who fell in the happy combat of the saints." At the moment of this martyrdom, Boniface, who was to be beheaded by the sword, "placed the sacred book of the Gospels upon his head as the sword threatened, that he might receive the deadly stroke under it and claim its protection in death, whose reading he loved in life."
Source: Ecclesiae Fastos (Vatican.va)