Joe 2:16 (KJV) Gather the people, sanctify the congregation, assemble the elders, gather the children, and those that suck the breasts: let the bridegroom go forth of his chamber, and the bride out of her closet.
This is when the church was revealed. She was revealed when Jesus came out of his chamber.
Those things happened at the time of Jacobs trouble. The time when many of the saints that slept in the dust of the earth were raised, some to everlasting life and some to everlasting contempt.