I have an aungel which that loveth me,
That with greet love, wher so I wake or sleepe,
Is redy ay my body for to kepe.
And if that he may feelen, out of drede,
That ye me touche, or love in vileynye,
He right anon wol sle yow with the dede,
And in youre yowthe thus ye shullen dye.
– Geoffrey Chaucer
The Canterbury Tales, The Second Nun’s Tale. On their wedding night Cecilia warns her new husband Valerian that a guardian angel is watching over her virginity. If Valerian touches or loves her lecherously, the angel will immediately slay him in the act and he will die in his youth.