Jesus went all over Galilee, teaching in the synagogues, preaching the Good News about the Kingdom, and healing people who had all kinds of disease and sickness.
And everywhere Jesus went, to villages, towns, or farms, people would take their sick to the marketplaces and beg him to let the sick at least touch the edge of his cloak. And all who touched it were made well.
As a result of what the apostles were doing, sick people were carried out into the streets and placed on beds and mats so that at least Peter's shadow might fall on some of them as he passed by.