Proper preposition for "absolve"
The preposition to use together absolved is of, or from.
The pardon absolved them of any crimes.
She has been absolved from her promise to serve on the committee.
Similarly to the second sentence, I would write from your sins.
I absolve you from your sins.
The word is very unusual outside a theological context, where the usual construction is 'absolve from', following the Latin.