Auspicato Concessum §16

¹⁶ We here recall a fact no less striking as a miracle than considered famous by the voice of hundreds of years. One day St. Francis was absorbed in ardent contemplation of the wounds of Jesus crucified, and was seeking to take to himself and drink in their exceeding bitterness, when an angel from heaven appeared before him, from whom some mysterious virtue emanated: at once St. Francis feels his hands and feet transfixed, as it were, with nails, and his side pierced by a sharp spear. Thenceforth was begotten an immense charity in his soul; on his body he bore the living tokens of the wounds of Jesus Christ.