What was Calvin’s practice?
In 1550 Calvin introduced another alteration in the discipline of the Genevese church. It being thought that sufficient effect was not produced by mere preaching, he determined that at certain seasons each minister, accompanied by one of the elders, should visit the houses of his parishioners, for the purpose of interrogating them as to their faith, and giving them instructions.
Thomas H. Dyer, The Life of John Calvin (New York: Harper & Brothers, 1855), 214–215.