When the captives were distributed to their new owners, he was given to Alei-Shnura, who was related to the Khan. By day John honestly served his master, but at night he went without sleep and prayed, patiently enduring insults and abuse. The master resolved to force his servant to become a Moslem, but John firmly declared that he worshiped Jesus Christ as God.
In the winter the Tatars tied him up and led him to a Russian cemetery, mortally wounded him with swords, and threw him into the snow. That night, Saint John reached the door of some Russians living in Kazan, and he asked them to summon a priest. He received the Holy Mysteries and prayed all night, then died the following morning.
Troparion — Tone 4
Your holy martyr John, O Lord, / Through his sufferings has received an incorruptible crown from You, our God. / For having Your strength, he laid low his adversaries, / And shattered the powerless boldness of demons. / Through his intercessions, save our souls!