Shrivel means to shrink and become wrinkled or withered. Shrive means to make one's confession or to hear confessions. Technically, the two words are unrelated; however, some people might think that being unshriven (not shriven) could lead to having a shriveled soul.
In Act I, Scene 2 of Shakespeare's The Merchant of Venice, Portia talks about one of the many suitors whom she is forced to consider for her husband:
. . . if he have the condition of a saint and the complexion
of a devil, I had rather he should shrive me than wive me.