Gevurot Meyruach Hakodesh 1:8

But you will receive ko'ach when the Ruach Hakodesh has come upon you, and you all will be the Eidus (the Witness) of me, in Yerushalayim, and in all Yehudah, and Shomron and as far as ad ketzeh ha'aretz.

Gevurot Meyruach Hakodesh 1:8