After Jesus returned to the Father, the disciples withdrew to the upper room. They may have been waiting for the Spirit, but they did not wait in silence. According to the Acts of the Apostles, they prayed up a storm.
In the ancient world, prayer wasn’t like it is now in many churches—private and mental or carefully scripted. People prayed aloud. By gathering together in the upper room, these women and men were already transgressing by avoiding rigid separation of the sexes. Perhaps married women lifted their voices along with their husbands’; perhaps some women even let their hair loose in holy abandon, as Christian women of Corinth are on record as doing a little later.