But you will receive power when the Holy Spirit comes upon you, and you will be my witnesses in Jerusalem, in all Judea and Samaria, and to the ends of the earth.”
In context
6So when they had come together they put this to him: “Lord, is this the time when you restore the kingdom to Israel?” 7He answered, “It is not for you to know times or seasons; the Father has fixed them by his own authority. 8But you will receive power when the Holy Spirit comes upon you, and you will be my witnesses in Jerusalem, in all Judea and Samaria, and to the ends of the earth.” 9When he had said this, while they watched, he was lifted up, and a cloud took him from their sight. 10They were still staring into the sky as he went, when two men in white clothes stood beside them