Polycarp was sent to be burned at the stake.  The flames arched around him and did not burn him, so he was then stabbed.  These are his words:

“Eighty and six years I have served Him, and He has done me no wrong. How then can I blaspheme my King and Savior? You threaten me with a fire that burns for a season, and after a little while is quenched; but you are ignorant of the fire of everlasting punishment that is prepared for the wicked.”

Then he said “I bless you Father for judging me worthy of this hour, so that in the company of the martyrs I may share the cup of Christ.”

An excellent original account of the death is here:  https://christianhistoryinstitute.org/study/module/polycarp