Acts 1:3-5

For forty days after his death he appeared to them many times in ways that proved beyond doubt that he was alive. They saw him, and he talked with them about the Kingdom of God. And when they came together, he gave them this order: “Do not leave Jerusalem, but wait for the gift I told you about, the gift my Father promised. John baptized with water, but in a few days you will be baptized with the Holy Spirit.”