I.15
On another occasion the saint accomplished something similar at the monastery of Luxeuil. A priest from the diocese called Winioc, the father of Bobolenus, who is now abbot of Bobbio, came to see blessed Columbanus. The saint was in the forest with the brothers in order to exploit the timber. When the aforesaid Winioc arrived and was marvelling at the force with which they split the trunk of an oak with their mallet and wedges, one of the wedges came flying from the trunk and cut him in the middle of his forehead, and drew gushing waves of blood from his veins. Columbanus, seeing the bone exposed and the blood streaming, at once fell on the ground in prayer. Then rising he healed the wound with his saliva so that hardly a trace of a scar remained.
(trans. Wood and O'Hara 2017: 125-126)