He wore chains with heavy iron crosses, and on his head was a heavy iron cap, for which they called him "John Big-Cap". In Moscow he went barefoot and almost naked in even the most severe frost, and he foretold the great misfortunes for Russia, the Time of Troubles and the incursion of the Poles, saying that "in Moscow will be many visible and invisible devils."()

Before death St. John indicated for himself a grave at the Pokrov church on Rva, afterwards called the Cathedral of Basil the Great. Having prepared himself for the grave, he removed the chains and showered himself with water three times. Before his death (+ 1589) the blessed one displayed the gift of healing. He was venerated at Moscow as a great wonderworker and seer. On June 12, 1672 his relics were uncovered, resting beneath a crypt in one of the chapels of the Cathedral of Basil the Great. The Service and Life were preserved in manuscripts of the seventeenth century.()