At the house, there was a large group of people who had gathered, and they were praying. They were praying of course, for the release of Peter. He initially had some trouble getting in because of their disbelief, but he finally made it. We find out then, that Mary s home was probably a regular hang out for the Christians of the day. We at least know that her home was place of prayer, and proved to be quite productive at times.
Prayer is a powerful force.
Opening your home to Christians is a good thing. Prayer with a group of Christians is the best. Expect the unexpected.