856
A.D.
Rabanus Maurus
Medieval
c. A.D. 780–856
“Observe, that he said the first time, I know not what thou sayest; the second time, He denied with an oath; the third time, He began to curse and to swear that he knew not the man. For to persevere in sinning increases sinfulness, and he who disregards light sins, falls into greater.”