When Was Confession Instituted?

I infer you meant “instituted” vs. instigated. Jesus Christ instituted the sacrament of Confession on the evening of that first Easter Sunday, giving his apostles—and their designated successors—the power to forgive sins, as the Catechism of the Catholic Church, paragraph 1485 conveys in citing John’s Gospel:

On the evening of that day, the first day of the week, Jesus showed himself to his apostles. He breathed on them, and said to them: “Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained” (John 20:19, 22-23).

For more information, see our tracts on “Confession” and “The Forgiveness of Sins.”