The "sin unto death" is, for instance, what Ananias and his wife Sapphira did in Acts or what Nadab and Abihu did in Leviticus. It was so shameful that God killed them on the spot.
Well, you'll need newground coffee, a goat fetus and some feathers from the mexican bull-ostrich. It must be performed at midnight. Shake the feathers while walking in circles around the ostrich.
Then you... no wait, I'm not going to tell you this.