Acts 1:3-7

Over the course of forty days after the death he suffered, he showed himself to them, proving that he was alive with convincing evidence. He appeared to them, and told them about the kingdom of God.

While he was still with them he instructed them, “Do not leave Jerusalem. Wait to receive what the Father promised, just as you heard it from me.

It's true that John baptized with water, but in just a few days' time you will be baptized by the Holy Spirit.”

So when the disciples met with Jesus, they asked him, “Lord, is this the time when you will re-establish Israel's kingdom?”

“You don't need to know about the dates and times that are set by the Father's authority,” he told them.