Joined Together Constantly In Prayer

On one occasion, while he was eating with them, he gave them this command: “Do not leave Jerusalem, but wait for the gift my Father promised, which you have heard me speak about. For John baptized with water, but in a few days you will be baptized with the Holy Spirit.” ... They all joined together constantly in prayer, along with the women and Mary the mother of Jesus, and with his brothers.

Source: Bible  -  Acts 1:4, 14